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From: Richard Smith <null@void.com>
Newsgroups: rec.crafts.metalworking
Subject: Re: FWIW first welding job, 2 years on
Date: Wed, 11 Dec 2024 21:01:27 +0000
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"Jim Wilkins" <muratlanne@gmail.com> writes:

> "Richard Smith"  wrote in message news:m1jzc6u3ox.fsf@void.com...
>
> "Jim Wilkins" <muratlanne@gmail.com> writes:
>
>> Bending / welding allowances
>
> You are well ahead of me.  i doubt i can help.
>
> 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.
>
> --------------------
>
> 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.
>
> 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.