Section

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5. WELD SYMBOLS 3, ANSI/AWS SPECIALS

6. LOCATION OF SYMBOLS 1, BUTT WELDS

7. LOCATION OF SYMBOLS 2, BUTT WELDS

8. LOCATION OF SYMBOLS 3, FILLET WELDS

9. SUPPLEMENTARY SYMBOLS 1, WELD SURFACE SYMBOLS

10. SUPPLEMENTARY SYMBOLS 2

11. SUPPLEMENTARY SYMBOLS 3, ANSI/AWS

12. DIMENSIONS 1, BUTT WELD METAL

13. DIMENSIONS 2, BUTT WELD PREPARATION, ANSI/AWS

14. DIMENSIONS 3, FILLET WELD, TRANSVERSE

15. DIMENSIONS 4, FI LLET WELD, TRANSVERSE

16. DIMENSIONS 5, FILLET WELD, LONGITUDINAL, ISO/BS

17. DIMENSIONS 6, FILLET WELD, LONGITUDINAL, ANSI/AWS

18. PROCESS IDENTIFICATION

19. STUD WELDS

20. SPOT AND SEAM WELDS

21. NONDESTRUCTIVE TESTING SYMBOLS, ANSI/AWS

22. EXERCISE 1, FLANGE ENDED PIPE

23. EXERCISE 2, VESSEL

24.. EXERCISE 3, TANK

25. EXERCISE 4, BEAM

1. THE NEED TO SPECIFY WELDS

2. THE ADVANTAGES OF SYMBOLS

3. WELD SYMBOLS 1, BUTT/GROOVE WELDS

WELD SYMBOLS ON DRAWINGS

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SECTION 23: EXERCISE 2, VESSEL

23 (Base transparency+2 overlays)

BASE TRANSPARENCYSymbols representing ",!elds to be made: letters in circles are for ease of reference below only.

Problem 1. Describe welds to be made, with sketches where necessary.

Comments1 The standard used for welding symbols has not been identified: there are six <;i~d" ;"d;~~~:~~~

that it is to ANSI/AWS.A: process abbreviation in fork is alphabetical.B, C, 0: 3 x 'melt-thru' symbols.Band 0: 2 x 'radiographic test' symbol.

2 A: stud arc welding, confirmed by studs on drawing.

3 Band 0: single-V butt weld with melt-thru, ground flush inside and radiographed.

4 C: single-bevel butt weld, stub pipe only bevelled, (set-on branch), with melt-thru, ground flushinside.

5 E: fillet weld, of 6mm leg length, both sides of joint. See sketches on overlay (a) forinterpretation.

a OVERLAY: possible interpretations of flange to tube joint E.F: this is consistent with the weld symbol, but the view does not show the expected projectionof the tube through the flange: also a form unlikely to be used, because of clearance problems.G, H: consistent with weld symbol and drawing. To decide between these two, it would benecessary to have details of the flange.

Problem 2. Modify symbols to conform to BS 499: Part 2: 1980, with joint as at H.

b OVERLAY: symbols to BS, solution to problem 2.I: symbol replacing A.J: symbol replacing B: note that BS can only specify NOT, not specifically radiography. Asthere is no 'melt·thru' symbol, only full penetration and a flat rear face can be specified: thesymbol requirements would be met by welding to produce a substantially flat surface, withoutfurther treatment.K: symbol replacing C }L: symbol replacing 0 see comments on J aboveM: Symbol replacing E

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SECTION 25: EXERCISE 4, BEAM

Problem. Sketch in welding details and symbols to BS 499: Part 2: 1980 (or other standard asinstructed).

B We cannot use a 'weld all round' symbol for the end flange joints, as it cannot go over top andbottom of the flanges, and it is interrupted by the cope·holes.

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CommentsA Cope·holes have been introduced to avoid the need to dress welds where they meet other welds,

and to avoid welding up into corners, often a site for defects.

o A suggestion to be taken seriously! Apart from simplifying the drawing, complete shopfabrication can considerably reduce the costs of welding and of quality assurance.

C Similarly to B, the web-to·flange joints are in four sections, needing four arrows if they are to beshown individually.

The spacing in BS is not the pitch (here 300mm) but the distance between the ends of weldelements, here (300-100) = 200mm.

25 (Base transparency andoverlay)

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