Preliminary study of on cladding process on gray cast iron substrate

IJRET: International Journal of Research in Engineering and Technology eISSN: 2319-1163 | pISSN: 2321-7308
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Volume: 02 Issue: 11 | Nov-2013, Available @ http://www.ijret.org 5
PRELIMINARY STUDY OF ON CLADDING PROCESS ON GRAY CAST
IRON SUBSTRATE
Hussein, N. I. S1
, Kamarul S. R.2
, Ayof, M. N3
1, 3
Senior Lecturer, Department of Manufacturing Process, Faculty of Manufacturing Engineering, Universiti Teknikal
Malaysia Melaka, Malacca, Malaysia,
2
Student, Department of Manufacturing Process, Faculty of Manufacturing Engineering, Universiti Teknikal Malaysia
Melaka, Malacca, Malaysia,
izan@utem.edu.my, kamarul.shaufi@student.utem.edu.my, nizam@utem.edu.my
Abstract
Cladding, also called as hardfacing or surfacing, is a deposition process with a purpose of improving the properties of the substrate
accomplished either using laser beam or arc as the heat source for the process. Filler material used in the process is deposited layer-
by-layer until covering required thickness before being machined to achieve the final dimension. Gas metal arc welding is seen as the
best method for accomplishing the cladding operation as the alternative for laser cladding in term of operation cost. The process
parameters of gas metal arc welding are discussed on in the aspect of the cladding process. Grey cast iron with its inherent brittleness
characteristic is difficult to be weld cladded because the thermal cycle of the cladding process can cause the material to crack. It is
understood that the coarse graphite flake structure that gives the lack of ductility characteristic to the material and cause the material
to crack when suffer the stress occur during the temperature drop of the process. Nickel based filler material is seen as the best choice
to be used for the deposition process because of its ability to precipitate carbon in its free form of graphite and prevent the migration
of carbon from cast iron substrate thus avoiding the formation of hard carbide phase. The addition of tungsten carbide in the matrix
of nickel base alloy gives the filler material good hardness and wear resistant properties. This paper serves as the preliminary study
to get an insight into the understanding of cladding process on cast iron as the substrate before performing the experiment of the
cladding operation.
Keywords: Cladding, Hardfacing, Cast Iron, Nickel Based Alloy
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1. INTRODUCTION
Surface treatment technology is employed to functional parts
with the purpose to ensure that they possess certain properties
and characteristics like wear and corrosion resistant and high
hardness. Some example of surface treatment processes are
mechanical plating, case hardening, thermal spraying, vapor
deposition, and cladding technique. The weld cladding
technique, either for the purpose of manufacturing or repairing
components, is commonly used in wide range of industries [1].
In manufacturing industry, the term cladding may refer to roll
cladding, explosive cladding, sheet cladding, or braze cladding
[2], but throughout this paper the term cladding is strictly
focused to weld cladding.
1.1 Cladding
Cladding, also called as Hardfacing or surfacing, is a type of
deposition process where a filler material is deposited onto the
substrate layer-by-layer with the objective to improve the
properties of the substrate. The cladding process can be
accomplished by using either laser beam or arc as the heat
source for melting the filler material during depositing onto
the surface of the substrate. Laser cladding technique is the
cladding process that utilizes laser beam as the heat source and
the filler material is deposited by powder injection [3].
Weld cladding technique is the cladding process that utilizes
arc as the heat source which is accomplished using welding
equipment. Weld cladding process is similar to arc welding
process but the difference is that weld cladding not aiming for
joining separate parts. Weld cladding can be realized through
any one of these arc welding techniques; gas metal arc
welding (GMAW), flux cored arc welding (FCAW), shielded
metal arc welding (SMAW), gas tungsten arc welding
(GTAW), plasma arc welding (PAW), and electroslag welding
(ESW) [2].
1.2 Background of Development
Weld cladding techniques were initially developed for the use
of navy defense components by Strachan & Henshaw, Bristol;
a major defence and nuclear engineering company [2]. The
developed cladding techniques were to be used on components

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where the equipment needs to work in seawater with minimum
maintenance and be exposed to very high pressure and shock
loading. The revolution of cladding process is comparable to
rapid prototyping and rapid manufacturing using layered
processes [4]. Nowadays, the cladding techniques are being
utilized in a wide range of industries such as food processing,
fertilizer, chemical, petrochemical, automotive, and, nuclear
and power plant [1, 2, 5, 6].
1.3 Principle of the Process
In cladding techniques, the filler material is deposited onto the
substrate in multiple of layers until essential thickness is
achieved before being machined to achieve the required
dimension. Figure 1 shows an arrangement of bead and
interpasses of weld clad onto cast iron substrate based on the
work of Buchanan et al. [1] in their study on microstructure
and wear resistant behaviour cladding on grey cast iron. The
filler material is deposited until three layers and then, the clad
machined to get the total thickness of 6 mm.
Fig-1: Arrangement of bead and interpasses of weld onto cast
iron substrate [1].
There is also another situation where the clad is deposited just
to cover a small portion of a surface like in repair welding. In
the case where crack happened on cast steels, a certain amount
of material from the cast steels is removed in shape of V-
groove around the crack before the weld-repair is performed
[5]. Figure 2 shows the cladding layers arrangement of the
repair welding using the principle of buttering technique based
on the work of Branza et al. [5] in their study on weld-repair
on heat-resistant cast steels.
Figure 2 is showing the principle of buttering technique which
passes 1-12 are buttering passes with a soft and ductile filler
material and passes 13-26 are filling passes with a heat-
resistant filler metal. The idea of using soft ductile filler
material for the buttering passes is to sustain strain and stress
which generated by the welding process and therefore prevent
crack from occurring.
1.4 Application in Industries
The weld cladding technique is regularly applied in various
types of industries, either for the purpose of maintenance or
manufacturing new component [1]. According to Buchanan et
al. [1], the cladding technique is used to reduce wear of grey
cast iron mill rollers in the sugarcane industry. Reducing the
wear of the rollers helps in the use of greater extraction loads
and better movement of the crushed cane through the rollers.
Fig-2: Cladding layers arrangement of weld-repair on heat-
resistant cast steels [5].
Cladding is also used for repair welding on heat-resistant cast
steels which are widely used for the manufacturing of
component parts for the petrochemical industry [5]. Whereas
Chatterjee and Pal [6], stated that cladding is used on top
bearing plate of coal crushing unit in power plant industry in
India.
2. GAS METAL ARC WELDING (GMAW)
Gas metal arc welding is one of the arc welding techniques
widely utilized for the cladding process. GMAW offers a
relative economical and low cost but high power density and
allows good process control rate of rapid processing [7]. By
providing proper manipulation system, GMAW has high
potential in being operated for robust and rapid layered
deposition processes.
2.1 GMAW Based Deposition Process
GMAW technique uses consumable electrode which is in the
form of wire feedstock and according to Clark et al. [7], the
use of consumable electrode offers a standard consumable
form provides consistent feed angles during the additive
manufacturing process which is a significant advantage. Also,

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the deposition process using wire feedstock, if compared to
the powder-based techniques, has further advantage in the
aspect of material utilization.
Schneebeli et al. [8] was the first to propose wire-based metal
deposition. In gas metal arc (GMA) shape metal deposition
system, the consumable electrode wire is melted by the
generated arc and the droplets of molten metal are deposited
onto a substrate in a sequential of layers until specific width
are covered. This shaped metal deposition process has
potential application in building a structure (rapid
manufacturing) and repairing worn out parts. Zhang et al. [9]
has established GMAW-based rapid prototyping system
performing layered deposition process and able to fabricating
numerous complex parts. However, the case of rapid
prototyping is difference from weld cladding as its purpose is
not for improving the properties of the substrate.
2.2 Process Parameters in GMAW
In weld cladding through the method of GMAW, the role
process parameters is a bit difference from the welding for
joining purpose as in cladding, the depth of penetration of the
process need to be as minimum as possible to get minimum
dilution [12]. The required optimum parameters to be achieved
are not for the quality of joining parts but for the quality of the
clad.
Karadeniz et al. [10] mentioned that the parameters of GMAW
can be divided into several groups. The first group is the first
order adjustable parameters which are the welding current, arc
voltage and welding speed. The second group is the second
order adjustable parameters consist of the torch angle, free
wire length, nozzle distance, welding direction, welding
position, and the flow rate of shielding gas. These two groups
are the parameters defined before the welding process and can
be changed during the process. Furthermore, the wire
electrode diameter and its chemical composition, and the type
of shielding gas are the parameters defined before starting the
welding process and cannot be changed during the welding
process.
The arc and the welding bath are affected by the process
parameters and when all the parameters are in conformity, the
perfect arc can be achieved [10, 11]. Karadeniz et al. [10] also
stated that enough penetration, high heating rate and right
welding profile are the aspects of welding joint quality.
However, in this paper, the discussion of using GMAW is for
cladding purpose and not for joining two separated parts.
There are differences in terms of quality between the bead of
weld-cladding and weld-joining.
When cladding is performed, the preferred geometry of the
bead is the one which has minimum penetration depth,
maximum bead width, reinforcement, and minimum dilution
percentage [12]. Figure 3 shows the weld bead geometry as
defined by Palani et al. [12].
Fig-3: Weld bead geometry [12].
2.3 Current
Increase in welding current leads to increasing depth of
penetration and bead width [13]. In their research on the effect
of process parameters on penetration in GMAW using DIN
EN 10120 steel as the substrate, Karadeniz et al. [10] found
that the welding current affects penetration depth about 2.5
times greater than arc voltage and travel speed. Getting the
optimum value of welding current is important because as far
as cladding is concerned, minimum depth of penetration needs
to be achieved but at the same time, maximum bead width is
also achieved.
2.4 Arc Voltage
Arc voltage does not give significant effect on penetration
depth as welding current does but still, arc voltage gives
significant effect on the bead width [10, 13]. Also, Shahi and
Pandey [14] mentioned that increased arc voltage increases the
arc cone, therefore the arc is spread over a larger area of the
substrate which leads to less welding penetration; less
penetration depth means less dilution of the filler material.
However, excessive arc voltage can cause spatter, porosity,
and also undercut. Any increment of arc voltage or welding
arc will make the heat input of the welding process rises.
2.5 Travel Speed
Travel speed gives significant effect on the filler material
deposition rate and thermal transmitted to the substrate.
Decreasing the travel speed will decrease the thermal
transmission to the substrate but increase the filler material
deposition rate. However, according to Shahi and Pandey [14],
travel speed gives less effect on dilution compared to arc
voltage because changing in travel speed will change the
geometry of the bead proportionally. Minimum dilution is a
target in cladding, therefore lower travel speed is more prefer
because by doing so, less penetration is achieved and so, less

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dilution. Higher travel speed is also not preferable because
undercutting might occur if travel speed is too high.
3. CAST IRON
Cast iron can be defined as an alloy which the main element is
iron and the major alloying elements are carbon and silicon.
Other alloying elements that would be in the composition of
various types of cast iron in the industry today are nickel,
copper, chromium, vanadium, molybdenum, boron and more
others. It is commonly considered that cast iron is a difficult
material to be welded because of the inherent brittleness of the
material and the effect of weld thermal cycle on its
metallurgical structure [15]. There are five major types of cast
iron in the industry today; gray, ductile, white, malleable, and
compacted graphite cast iron. The one which is used as the
substrate for this research is gray cast iron.
3.1. Gray Cast Iron
Gray cast iron, or easily called as gray iron, is the most
common form of cast iron. This type of cast iron has moderate
strength, excellent damping and machinability, but poor
ductility. It contains 2 to 4% C, 1 to 3% Si, and up to 1% Mn,
and has a tensile strength up to 275 MPa [16]. It is also
reported that gray iron has low hardness value; 25 – 35 HRC
(~ 260 – 340 HV) [17]. The typical microstructure of gray iron
is a matrix of α-ferrite or pearlite matrix with graphite flakes
spread all over the matrix. Figure 4 shows the optical
micrograph of gray cast iron.
3.2 The Cladding of Gray Cast Iron
Cladding is a deposition process in which involves producing
heat to melting the filler material onto the substrate. The
problem lies when gray iron as the substrate is that the
material suffers thermal cycle produced by the process. The
lack of ductility due to the coarse graphite flakes structure in
gray iron makes the material often fails to withstand stresses
caused by temperature drop [15]. The inherent brittleness
characteristic makes gray iron vulnerable to cracking upon
cooling of the process.
Pouranvari [15], in his study on the weldability of gray cast
iron using nickel based filler material concluded that the
cracking problem can be solved by using nickel based filler
material and proper post-weld heat treatment. Using the nickel
based filler material alone without post-weld heat treatment
just can only solve the problem in fusion zone (FZ) but not in
heat affected zone (HAZ) as the thermal cycle of the process
allows martensite formation in HAZ that leads to the cracking
problem.
Fig-4: Optical micrograph of gray cast iron with 500x
magnification: the dark graphite flakes are embedded in α-
ferrite matrix [18].
However, even though crack defect always seen as problem
and need to be avoided, that depends on the function of the
substrate in its real operation. Chatterjee and Pal [6], in their
research on wear behavior of cladding on gray iron substrate,
where gray iron is used as the material for top bearing plate in
coal crushing unit of thermal power plant, mentioned that
cracking does not always significantly decrease the service
wear life of the component, but occasionally acts as a benefit
in decreasing residual stress level.
4. FILLER MATERIAL
Filler material for cladding purpose is chosen based on the
required final properties of the clad like wear resistance or
corrosion resistance for example. Some of the filler materials
used for cladding cast iron are copper based alloy, stainless
steel, and nickel based alloy [19].
4.1 Types of Filler Materials for Cladding Cast Iron
Copper based alloy is used for the purpose of corrosion
resistance or building up surfaces of wear. Copper based alloy
is also reported can give superior thermal fatigue resistance in
laser cladding on gray cast iron [20].

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Fig-5: Martensite formation in the heat affected zone of gray
iron substrate [15].
Stainless steel filler material is used for increasing the
corrosion and oxidation resistance properties. However, when
using stainless steel as the filler material in cladding cast iron,
the migration of carbon from the substrate into the stainless
steel deposit usually cause cracking problem. The absorption
of carbon into stainless steel causes the formation of
chromium carbide which leads to the cracking problem. This
problem is solved by using nickel based alloy for the buffer
layer in the clad. Nickel based alloy helps in reducing the
carbon migration from the substrate into the stainless steel
layer because of the low diffusivity of carbon in nickel based
alloy. The disadvantage of using nickel based alloy as the
buffer layer is its high cost [6].
Nickel based alloy have the characteristic of outstanding wear
and corrosion resistance properties at elevated temperature,
either on their own or with the combination of other
reinforcement particles [21]. Another advantage in using
nickel based alloy as the filler material is the ability
precipitates the carbon from the cast iron substrate in the form
of graphite, thus preventing the formation of carbide [15].
Among the mechanical parts which used nickel based alloy in
their manufacturing are piston rings, rollers in steel making,
roller tables, wearing plates and pump shafts in box packing
areas [22].
4.2 Tungsten Carbide Reinforced NiCrBSi Alloy
Many research in cladding using this alloy for the deposition
are done using laser cladding and plasma transferred arc
(PTA) technique in which the alloy is supplied in the shape of
powder [23, 24, 25, 26, 27]. The addition of tungsten carbide
particles in the material significantly increases the wear
resistance and the overall hardness of the alloy. Figure 6
shows the alloy with most percentage of tungsten carbide
addition has highest wear resistance compare to the ones with
less and no tungsten carbide addition whereas Figure 7 shows
the comparison in terms of hardness.
Fig-6: Wear rates of the NiCrBSi and NiCrBSi/WC–Ni
coatings [27].
However, there is not many literature reviews on tungsten
carbide reinforced NiCrBSi alloy consumables deposited
using GMAW technique. According to Mendez et al. [28],
tungsten carbide (WC) reinforced nickel based alloy
consumables usually available with NiBSi or NiCrBSi matrix
alloy with the matrix microstructure is usually contained of
soft primary nickel dendrites with relatively low hardness of
about 350HV whereas the inter-dendritic regions consist of
hard carbides, borides, and silicides with hardness of about
500 to 800 HV. Figure 8 shows the backscattered SEM
micrograph of the alloy microstructure obtained using GMAW
and hot-wire GMAW.
The tungsten carbide (WC and W2C phases) reinforced
NiCrBSi filler alloy was also reported to have even higher
hardness; the NiCrBSi matrix having the hardness of 560 to
620 HV and the carbides having the hardness of 2340 HV
[29]. In this research, the tungsten carbide reinforced in
NiCrBSi matrix alloy consumable will be used for cladding
using GMAW technique.
CONCLUSIONS
Gray cast iron is difficult to welded mainly because the natural
characteristic of cast iron which is inherently brittle and has
tendency to cracking when subjected to the temperature drop
cause by the arc welding process. The weld cladding by using
gas metal arc welding technique and method would be
accomplished effectively without cracking by choosing nickel
based alloy as the filler material.

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Fig-7: Micro hardness profiles of the NiCrBSi and
NiCrBSi/WC–Ni coatings [27].
Fig-8: Backscattered SEM micrographs of typical Ni-WC
alloys microstructure obtained using GMAW and hot-wire
GMAW [28].
The nickel based alloy material can prevent the migration of
carbon from the cast iron substrate into the fusion zone thus
preventing the carbide phase to form in the fusion zone.
Moreover, nickel can precipitate the carbon in the form of
graphite therefore the martensite formation can be prevented.
The reinforcement of tungsten carbide into the nickel based
alloy matrix provides high wear resistant and hardness
properties. The tungsten carbide reinforced alloy filler
material is available in the form of powder to be used in laser
cladding and also in the form of wire to be used with gas metal
arc welding equipment. While laser cladding technique is the
more popular choice to perform the cladding process, gas
metal arc is more economic yet flexible in its operation. Future
work should focus more detail on the technique of the
cladding operation using GMAW equipment in optimizing the
process parameters to find the right combination of the
parameters with optimum values to maximize the required
properties of the clad beside performing the cladding
operation experiment.
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BIOGRAPHIES
Dr. Nur Izan Syahriah bt. Hussein is a
senior lecturer and the head of Department
of Manufacturing Process in Faculty of
Manufacturing Engineering in Universiti
Teknikal Malaysia Melaka (UTeM),
Malacca, Malaysia. She is specializing in
welding and near net shape manufacturing
processes.
Mohd Kamarul Shaufi Bin Rasidi is
currently pursuing his post graduate study
at the Faculty of Manufacturing
Engineering, Universiti teknikal Malaysia
Melaka (UTeM), Malacca, Malaysia. He
is currently focusing in GMAW based
cladding process.
Mohamad Nizam b. Ayof is a senior
lecturer in the Department of
Manufacturing Process in Faculty of
Manufacturing Engineering in
Universiti Teknikal Malaysia Melaka
(UTeM), Malacca, Malaysia. His
research areas are physics and laser cutting.

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