Simple welded connection using Fillet weld
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The document is a presentation on the design of simple welded connections using fillet welds, specifically focusing on their definition, types, and specifications for size and effective length. It details the requirements for minimum weld size based on plate thickness and outlines the effective throat thickness and strength calculations for fillet welds. The document emphasizes the importance of proper weld design to avoid cracking and ensure structural integrity.
Simple welded connection using Fillet weld
- 1. Subject Guide : Dr. P.C Saha Group - 28 Submited by : Shivam Kumar ( 1801608 ) (Roll nos.) Shubham Singh ( 1801609 ) DESIGN OF STEEL STRUCTURES KALINGA INSTITUTE OF INDUSTRIAL TECHNOLOGY BHUBHANESWAR Date of Presentation : 12/11/2019 Simple welded connection using Fillet weld
- 2. Fillet welds Fillet welding refers to the process of joining two pieces of metal together whether they be perpendicular or at an angle. These welds are commonly referred to as Tee joints which are two pieces of metal perpendicular to each other or Lap joints which are two pieces of metal that overlap and are welded at the edges. Ease of fabrication and adaptability Less precision No special edge preparation Throat of a weld Concave and convex surfaces Theoretical throat (t=0.707s) t Te s Root of weld Face of weld Weld and leg size 1
- 3. Types of fillet weld 2
- 4. Types of fillet weld 3
- 5. st (a) Concave s (b) Convex st (c) Under cutting Cross section of Fillet weld 4
- 6. The size of normal fillet weld shall be taken as the minimum weld leg size . For deep penetration welds with penetration not less than 2 . 4 mm , size of weld is minimum leg size + 2 . 4 mm . Size of Fillet welds Effective throat thicknessshall not be less than 3 mm and shall not generally exceed 0 . 7 t ( ort under special circumstances ) where t is the thickness of the thinner plate at the elements being welded . 5
- 7. Minimum size of fillet weld specified in 3 mm . To avoid the risk of cracking in the absence of preheating the minimum size specified are : For less than 10 mm thickness plate - 3 mm For 10 to 20 mm thickness plate - 5 mm For 20 to 32 mm thickness plate - 6 mm For 32 to 50 mm thickness plate - 8 mm Size of Fillet welds 6
- 8. The effective length of the weld is the length of the weld for which specified size and throat thickness exist . While welding length made is equal to effective length plus twice the size of the weld . Effective length should not be less than 4 times the size of the weld . Effective length of the weld 7
- 9. Size of fillet weld ( s ) Minimum - 3 mm ( < 10mm ) - 5 mm ( 10 - 20 mm ) Maximum - Thinner plate - 1 . 5 mm or ¾ thk. Of angle section Throat of fillet weld ( t ) t = KS ( K = 0 . 7 , 0 . 65 , 0 . 6 ) Effective length of the fillet weld ( l ) l = L - 25 Strength of fillet weld P = pq X l x t ( where pq is Permissible stress in weld ) Design of fillet weld 8
- 10. 9 Thank you