Re: FWIW first welding job, 2 years on

"Jim Wilkins" <muratlanne@gmail.com> writes:

"Richard Smith"  wrote in message news:m1jzc6u3ox.fsf@void.com...
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"Jim Wilkins" <muratlanne@gmail.com> writes:
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Bending / welding allowances

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You are well ahead of me.  i doubt i can help.
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Press-brake - they have a press-brake, yes - good.
Not new when bought.  Is small "fabco.".
Seeing if corrections / calibrations needed to go in to the settings,
I think.
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Bending allowance can be determined by bending a small test coupon and
measuring the resulting lengths. I've seen welders hammer the cooling
beads but my night school training didn't cover that aspect, it seemed
to be done by experience and judgment instead of pre-planning.
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A practical example is welding a repair in a curved fender. A patch
dished to copy the existing fender shape will flatten from weld
shrinkage. If there's space behind, like on my pickup truck bed, I can
restore the curve with a hammer and dolly, but the integral steel
inner wheel well on the car blocks access for a dolly so if it had
antique value I'd need to preform the patch 'somewhat' deeper to
compensate, or build it up with filler.
jsw

Lot of experience there.

Funnily enough, was helping the boss on the press-brake today.  Ran out
of folded plate pressings and no other work, so did a run.  The boss had
me involved in his (our) measurements - getting the pressings from
"nearly" to matches drawing dimensions and angles.
Got some idea of the adjustable variables and what error can manifest as
on pressings.