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Up Topic American Welding Society Services / Technical Standards & Publications / Grinding welds...? (AWS D1.6 code work)
- - By motgar (**) Date 05-12-2012 15:22
Have a job that we are working on that is primarily made out of 304 SS rectangular tubing.  I am wondering when grinding is allowed, if at all.  Before inspection, after inspection?  The parts we are grinding are the corners where the flare groove and fillets welds intersect.  If that makes sense....  As I stated before, this is D1.6 code work.  Final destination is California.  Not sure if seismic loading plays a role, in weld transitions (i.e...  stress risers)  Thanks in advance for any help, insight anyone can offer.

Garrett
Parent - - By 803056 (*****) Date 05-13-2012 18:32
The code does not prohibit grinding.

If welds are to be ground, there is always a concern that the adjacent base metal may be thinned due to over grinding.

Fatigue life can be improved by removing stress risers such as may exist at the toe of welds, undercut at corners, etc. when grinding is used with some level of care.

If the welded structure is fabricated using HSS, I would be more concerned that the provisions for tubular structures are met.

Best regards - Al
Parent - By motgar (**) Date 05-15-2012 22:58
Al,

Thanks for the advice.

Does the same 1/32 or 5% of base metal thickness whichever is smaller still apply for over grinding?

What do you mean by "provisions for tubular structures are met??"

Is it better to blend in weld tie ins, before a CWI VT's them?  I guess might have been a better question to ask.

Garrett
Parent - - By Joey (***) Date 05-14-2012 09:47
When grinding is allowed, it should be done before visual inspection.

~Joey~
Parent - - By 803056 (*****) Date 05-14-2012 13:45
Can you show me the code provision that states the visual inspection must be completed before grinding?

I see no need to insist on VT by QC before permitting the welder to correct a nonconforming weld profile. Is QC going to inspect every temporary tack weld before the welder is permitted to grind it flush with the adjacent base metal? Is QC then going to reinspect the area where the weld was ground flush?

I sense a QC department that is looking for work and a reason to justify their existance.

Best regards - Al
Parent - - By jrw159 (*****) Date 05-14-2012 19:36
Al,
  I might be missing something here but I think he is saying to grind before inspection. :wink:

jrw159
Parent - - By ctacker (****) Date 05-14-2012 19:48
cut him a break John, we all have out "senior" moments. :wink:
Parent - By jrw159 (*****) Date 05-14-2012 21:50 Edited 05-14-2012 21:52
Just good natured ribbing. :lol: It is not often that we catch Al in a "senior moment".

jrw159 :cool:
- - By 803056 (*****) Date 05-14-2012 21:38
Thanks for being kind ctacker.

Getting old isn't fun, but the alternatives are worse.

Al :red:
Parent - - By jrw159 (*****) Date 05-14-2012 21:57
Al,
  I was not trying to be mean, sorry if it came across that way. :grin:

jrw159
Parent - By Milton Gravitt (***) Date 05-15-2012 14:29
Al the old saying is (what goes around will come around and bite you).LOL

                                 M.G.
- By 803056 (*****) Date 05-16-2012 03:36
My goal is to brighten everyone one's day, even if it is at my expense. With that said, "VENGENCE WILL BE MINE!"  AHHH HA HA HA HA.

:evil::evil::evil:

Al :cool:
Up Topic American Welding Society Services / Technical Standards & Publications / Grinding welds...? (AWS D1.6 code work)

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