What weld symbol is appropriate for this
What weld symbol is appropriate for this
(OP)
Hey guys,
hope you're all doing ok.
What weld symbol should be used for this pls see attachment.
I don't know, is it a fillet weld (not quite i guess) or a Y weld (also not quite it seems to me).
When going for the fillet symbol, should then "z" be used for weld size (leg length), since "a" would be confusing?
Thanks a bunch!
hope you're all doing ok.
What weld symbol should be used for this pls see attachment.
I don't know, is it a fillet weld (not quite i guess) or a Y weld (also not quite it seems to me).
When going for the fillet symbol, should then "z" be used for weld size (leg length), since "a" would be confusing?
Thanks a bunch!





RE: What weld symbol is appropriate for this
Symbol would then be |/ and since the penetration must be over the complete thickness there is no need to specify depth, correct?
p.s. why is root opening sometimes necessary to specify / use?
RE: What weld symbol is appropriate for this
RE: What weld symbol is appropriate for this
why is the rootopening necessary for good penetration in the first place? I don't quit get that.
Is it because from certain thicknesses on the tourch simply cannot get deep enough in de root?
RE: What weld symbol is appropriate for this
RE: What weld symbol is appropriate for this
AWS D1.1 Structural Welding Code/Steel imposes several conditions on the design. If the weld is made without backing and the WPS is not qualified by testing without steel backing, the weld is considered to be a partial joint penetration groove weld. The allowable stress on the weld is severely limited due the expectation there is a crack initiator in the unfused root, much like a fillet weld.
The groove angle is required to fall within a specific range if the detail is prequalified per figures 3.3 or 3.4 (PJP or CJP respectively).
If the groove detail is prequalified the root opening must fall within a specified range and steel backing must be used if it is welded from one side and it is necessary to be a complete joint penetration groove weld. Again, figures 3.3 or 3.4 are applicable if the groove detail is prequalified per AWS D1.1.
If the weld does not meet all the metrics of a prequalified joint, the contractor is required to qualify the WPS by testing. It would be prudent to qualify the WPS using the groove detail expected in production.
AWS A2.4 is the specification for welding symbols. In general, the welding symbol should include the depth of the bevel, the groove angle, the root opening, and if the weld is a partial joint penetration groove weld; the required weld size.
If the drawing is being generated by the Engineer, i.e., it is a structural drawing, it is only necessary to include the notation CJP in the tail of the welding symbol or both the required weld size and the notation PJP in the tail of the welding symbol if working to AWS D1.1. It would be th fabricator's responsibility to add any additional information to the welding symbol needed by the welder.
Best regards - Al
RE: What weld symbol is appropriate for this
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You wrote:
"... why is the rootopening necessary for good penetration in the first place? I don't quit get that.
Is it because from certain thicknesses on the tourch simply cannot get deep enough in de root? ..."
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A welding procedure is qualified by welding out a joint. The various welding variables (including the root gap) are documented. The qualification weld is tested. If all goes well, then a detailed WPS (welding procedure specification) is written up. The WPS is for the welder to follow in production welding. Production welding to the approved wps should result in a weld with similar characteristics as the original qualification weld.
The root opening (root gap) information could be required for various reasons. One is to facilitate the welding (for example: a gap would help to avoid excessive or inadequate root penetration). Another reason could be for metallurgical reasons (for example: a particular gap would achieve a desired dilution between base metal and filler metal in the weld). Another reason could be to make the penetration for accessible (for example: when welding with a backing plate the gap helps to ensure good penetration). Another reason could be for mechanical reasons (for example: a gap would help to avoid stress build up as a result of the contraction (shrinkage) of the weld during cooling.
Tanks.
Alexa
RE: What weld symbol is appropriate for this
kgp