1 / 30

CSWIP 3.1 Welding Inspection

CSWIP 3.1 Welding Inspection. Welding Terminology and Definitions. TWI Training & Examination Services. Course Reference WIS 5 Course notes section reference 1. Welding Terminology & Definitions. What is a Weld?

stephend
Download Presentation

CSWIP 3.1 Welding Inspection

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. CSWIP 3.1 Welding Inspection Welding Terminology and Definitions TWI Training & Examination Services Course Reference WIS 5 Course notes section reference 1

  2. Welding Terminology & Definitions • What is a Weld? • A localised coalescence of metals or non-metals produced either by heating the materials to the welding temperature, with or without the application of pressure, or by the application of pressure alone (AWS) • A permanent union between materials caused by heat, and or pressure (BS499)

  3. Welding Terminology & Definitions What is a Joint? • The junction of members or the edges of members that are to be joined or have been joined (AWS) • A configuration of members (BS499)

  4. Joint Terminology Edge Lap Open & Closed Corner Butt Tee Cruciform

  5. Butt Preparations Square Edge Closed Butt Square EdgeOpen Butt

  6. Single Sided Butt Preparations Single Bevel Single Vee Single-U Single-J Single sided preparations are normally made on thinner materials, or when access form both sides is restricted

  7. Double Sided Butt Preparations Double -Vee Double -Bevel Double Double - J - U Double sided preparations are normally made on thicker materials, or when access form both sides is unrestricted

  8. Joint Preparation Terminology Included angle Included angle Angle of bevel Root Radius Root Face Root Face Root Gap Root Gap Single-V Butt Single-U Butt

  9. Joint Preparation Terminology Angle of bevel Angle of bevel Root Radius Root Face Root Face Root Gap Root Gap Land Single Bevel Butt Single-J Butt

  10. Weld Terminology Butt weld Spot weld Fillet weld Plug weld Edge weld Compound weld

  11. Welded Butt Joints Butt A_________Welded butt joint Fillet A_________Welded butt joint Compound A____________Welded butt joint

  12. Welded Tee Joints Fillet A_________Welded T joint Butt A_________Welded T joint Compound A____________Welded T joint

  13. Welded Lap Joints Fillet A_________Welded lap joint Spot A_________Welded lap joint Compound A____________Welded lap joint

  14. Welded Closed Corner Joints Fillet A_________Welded closed corner joint Butt A_________Welded closed corner joint Compound A____________Welded closed corner joint

  15. Weld Zone Terminology Face B A Weld metal Heat Affected Zone Weld Boundary C D Root A, B, C & D = Weld Toes

  16. Weld Zone Terminology Weld cap width Excess Cap height or Weld Reinforcement Excess Root Penetration

  17. Heat Affected Zone (HAZ) solid-liquid Boundary Maximum Temperature solid weld metal grain growth zone recrystallised zone partially transformed zone tempered zone unaffected base material

  18. Toe Blend 6 mm • Most codes quote the weld toes shall blend smoothly • This statement is not quantitative and therefore open to individual interpretation • The higher the toe blend angle the greater the amount of stress concentration • The toe blend angle ideally should be between 20o-30o 80° Poor Weld Toe Blend Angle 3 mm 20° Improved Weld Toe Blend Angle

  19. Features to Consider Fillet welds - Toe Blend

  20. Fillet Weld Profiles Fillet welds - Shape Mitre Fillet Convex Fillet A concave profile is preferred for joints subjected to fatigue loading Concave Fillet

  21. Fillet Weld Leg Length a b a. = Vertical leg length b. = Horizontal leg length Note: The leg length should be approximately equal to the material thickness

  22. Fillet Weld Features Excess Weld Metal Vertical Leg Length Design Throat Horizontal leg Length

  23. Fillet Weld Throat Thickness a b a = Design Throat Thickness b = Actual Throat Thickness

  24. Deep Penetration Fillet Weld Features a b a = Design Throat Thickness b = Actual Throat Thickness

  25. Fillet Weld Sizes Calculating Throat Thickness from a known Leg Length: Design Throat Thickness = Leg Length x 0.7 Question:The Leg length is 14mm. What is the Design Throat? Answer: 14mm x 0.7 =10mm Throat Thickness

  26. Fillet Weld Sizes Calculating Leg Length from a known Design Throat Thickness: Leg Length = Design Throat Thickness x 1.4 Question:The Design Throat is 10mm. What is the Leg length? Answer: 10mm x 1.4 = 14mm Leg Length

  27. Features to Consider Throat Thickness is larger Throat Thickness is smaller 1200 600 Fillet welds connecting parts with fusion faces with an angle more than 1200 or less than 600 should not use the previous calculations.

  28. Features to Consider (a) (b) 8mm 4mm 2mm 4mm Importance of Fillet Weld Leg Length Size Approximately the same weld volume in both Fillet Welds, but the effective throat thickness has been altered, reducing considerably the strength of weld B

  29. Fillet Weld Sizes Importance of Fillet weld leg length Size 4mm 6mm (a) (b) 4mm 6mm Question:How larger in c.s.a. is (b) comparable to (a)?

  30. Fillet Weld Sizes Importance of Fillet weld leg length Size (a) (b) 4mm 6mm (a) (b) 4mm 6mm Area = 4 x 4 =8mm2 2 Area= 6 x 6 =18mm2 2 The c.s.a. of(b)is overdoublethe area of(a) without the extra excess weld metal being added

More Related