Quote:
Originally Posted by AllyBill
You can pre-heat the job with a propane torch then spend a few extra seconds on each weld to allow a good heat-soak into the surrounding material. It's the local contraction that pulls your weld apart. If everything is preheated and already expanded the contraction is less localised but most important is to come off the heat slowly enough that the tack hardens under the flame and elongates naturally without cracking. Better still, if you can get on the back of the tack stretch it with hammer and dolly before it cools.
Been there, done that, thirty years of fabricating aluminium and I still learn something new every day.
Will
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It's not cracking apart until I start to work it on the e wheel or hammer and dolly.