They said what?

Date 11-15-2011 21:22

preheat on what thickness coupon?
Mild steel or some exotic high strength alloy?

for 3/8" mild steel, I'd say no heat required as long as it's above 32°F, if not 32°F, bring it up to 70°F before welding.
However, I still like to see them cook off any cutting oils or whatnot by waving a torch over the groove and wire brushing before starting in on the root pass.

By Mikeqc1 (****)

Date 11-15-2011 22:03

pre heat was specified in the wps.....it needs it.
Im besides myself.
repair on a welder qual?

By Lawrence (*****)

Date 11-16-2011 04:34

Does your welder qual WPS prohibit grinding?

I guess you need to say a few words about exactly the scope of the repair before anybody can give you any kind of reasonable response.

Throw us a bone Mike.

By Mikeqc1 (****)

Date 11-16-2011 20:17

the qual failed x-ray and they ground out the defect.
no grinding in the wps.
scope of repair grined half the test to get the JUNK out

By Lawrence (*****)

Date 11-16-2011 20:30

Yeah, I can see the whole "head explode" thing...

Sounds pretty much out of control.

By Mikeqc1 (****)

Date 11-16-2011 23:09

Yes Sir its is.

By TimGary (****)

Date 11-16-2011 02:39

Had a guy once insist on welding a downhill pass on a vertical joint to preheat the metal.
Couldn't convince the guy that was wrong.
Had to fire him.
Good riddance...

Tim

By welderbrent (*****)

Date 11-16-2011 12:08

It would be true to state that the root pass would 'pre-heat' the steel for the REST of the passes.

The problem is that it is not PRE-HEATED for the root pass.

At FABTECH right now without any code books to check exact wording, but PLEASE, pre-heat is to be done BEFORE ANY WELDING. Even any tacking.

Have a Great Day, Brent