Removing backing strips on cert plates??

[waltsuz]

Currently preparing cert plates for inspection. We use a scarfing tip in a torch to remove the backing strip. Occasionally we hit the plate and gouge the plate. We have been allowing the students to touch up this area and grind flush the nicked area. One instructor says to send the plate out with the gouge as touching up the area creates a hard spot which will cause a failure. Anyone have an opinion on this??...If you nicked a students cert plate would you allow a touch up/repair. It happens unfortunately, all of our instructors have had this happen at one time or another..Regards Walt

[JSFAB]

As far as I know, every cert with a backing plate I have, the backing plate is milled off.

[JMK WELDING]

When I took my D1-1 if you gouged out the plate itself while cutting off the backing plate it was scrap. Both my D1-1's are smaw and gmaw. It also might be ok if inspected allows it but I doubt it. If you grind it out and weld it they claim it puts undo stresses in the plate causing it to fail.

[bjfab]

Reweld

Touching the plate up is a FAIL. I did some inspection and any reweld would be rejected.

As an inspector it can not be judged properly when reworked. If there were small gouge marks and that is obviously what they were it possibly would pass.

I have tested at places where there were close to a hundred plates done in the morning and no marks from the torch.

Thanks

Byron

[waltsuz]

When I took my D1-1 if you gouged out the plate itself while cutting off the backing plate it was scrap. Both my D1-1's are smaw and gmaw. It also might be ok if inspected allows it but I doubt it. If you grind it out and weld it they claim it puts undo stresses in the plate causing it to fail.

These are D1-1 "GTAW"...I scarfed off 8-9 today and hit one. We have for the last 9 years that I can speak for always used the torch to remove the backing. We send these out for visual and destructive testing. I feel bad for the student, I nailed it, Ill ask him to do another. These are 3/8ths plate, this one was 3G. We have an AWS certified inspector at our campus. We use another facility for testing to eliminate bias situations. He said to do what you have to do , thought Id ask for a 2nd opinion....Thanks for the reply, Walt
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[JMK WELDING]

lots of luck it is best to do another. when you burn off the back don't get to close to the plate. make your student grind the rest off by hand until all the backing plate is gone. make sure eveything is flush with both sides of plates. do not grind below the plate surface. again lots of luck, Joe

[kevin]

dont over heat the root from grinding