2. Identifying of butt welds Teknologi Las kapal

3. Teknologi dan Rekayasa Welded joints Butt Edge

4. Teknologi dan Rekayasa Butt weld Types: Double welded butt Permanent or temporary backing Single welded butt Lower stress concentration Easier ultrasonic testing or radiography Expensive preparation

5. Teknologi dan Rekayasa Butt weld type Single vee Double vee Backed butt (permanent or temporary)

6. Teknologi dan Rekayasa Butt weld terminology Fusion face Root face Root gap Included angle Bevel angle

7. Teknologi dan Rekayasa Butt weld terminology Root run Toe Reinforcement

8. Teknologi dan Rekayasa Butt weld terminology

9. Teknologi dan Rekayasa Single welded butt joints Access to one side only  Pipe & hollow section butt joints Root run forms inside surface High fit-up tolerances required High skill required  Special welder qualification Root may be contaminated Inside is difficult to inspect

10. Teknologi dan Rekayasa Drawing of Weld symbols

11. Teknologi dan Rekayasa Drawing of Weld symbols

12. Teknologi dan Rekayasa Butt joint preparation 60 0 included angle Root faces Tacking Feather Tacks 1/16-1/8

13. Teknologi dan Rekayasa Butt joint preparation Root faces - 0 45 0 included angle Remove all mill scales and rust Tacking - not in groove Tack away from coupon area. Flush on backing

14. Teknologi dan Rekayasa Drawing of Weld symbols

15. Teknologi dan Rekayasa Butt Weld Positions

16. Teknologi dan Rekayasa Butt Weld Positions FLAT HORIZONTAL VERTICAL OVERHEAD

17. Teknologi dan Rekayasa Butt welds should: Have a flat to slightly convex face Be uniform in appearance Have equal leg size Have good wash-in into base materials This is an example of a butt weld: Butt weld inspection

18. Teknologi dan Rekayasa Enjoy the lesson !