I often hear of people having trouble with ali tack welds cracking using TIG but it's a simple problem. TIG allows you to do them so much quicker than with gas so soon as you come off the heat the weld you just made is quenched by the surrounding metal making it hard and stressing it as the material contracts fast. No surprise it then cracks. Where gas has the advantage in this scenario is in the time it takes to bring the job up to temp and the resultant heat soak.
Solution - take a little time, put some pre-heat in and let the tacks harden under the flame. Then you can use the propane torch you use for your pre-heat for all your soldering, brazing and heating your food.
Will
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William Pointer
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