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Hey all,A while back, I was fabbing up a stand for my 6x48" belt sander. I made a square frame out of 1" 14ga sq. tubing and drilled holes in some 1/8" strap to pass a bolt through to the mounting holes on the sander. I'd tacked the whole assy. together, lined up the holes, and tacked on the mount tabs. When everything looked like it would line up, I then welded everything up completely. Much to my chagrin,when the part cooled and I tried to fit it up to the sander, the holes no longer lined up (forcing me to re drill two of them.)My question is...is there any way to know how much a certain thickness of steel will expand after being MIG welded? My welder is only rated @ 140 amps and can't handle anything over 1/4", so I didn't think I'd warp the part so much. And I didn't go crazy on the welds...this wasn't the first time I'd warped a fabbed part...so I'm careful to only weld where structurally necessary, with enough voltage to produce a clean crackle weld arc.Basically, how do you deal with heat warpage when you need to keep a part to a close tolerance?
Reply:1 - start with larger holes in the stand or mounting assy.2 - reheat the part an adjust accordingly. There are several thead in this forum describing reheating the part opposite the weld.3- minimize welding. Only weld what is necessary. Don't let the arc hypnotize you, causing you to keep welding to see how many pretty welds you can put on a part.How far off were they that you had to redrill two holes? Reread your post you alread addressed #3. |
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发表于 2021-9-1 00:59:10