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  1. tickfaw

    alloy 20 tube to tube sheet welding

    Im having cracking problems on the root pass. Im welding 3/4" alloy 20 tubes (.065 wall) to an alloy20 tubesheet (2" thick). We are making a 2 pass strengh weld, saving the tube end. We are maintaining a 250 degree preheat and slow cooling, using ER320 filler on both passes (.045 on...

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