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sz.barti wrote:Hello welders!
I was welding checker ally plate 6 mm tick and during tackink the tack had cracked every one. When I start welding it weld cracked to question is why?
Facts: I was useing 2.4 ally filler with 5% silicone welder was setup around 200 amps plate was v grooved on both sides half way, I did not preheated whole plate only preheated around 2 inches whit a tig torch in the place where I started welding going forward and backward and when puddle was hot enough I pushed the filler in and still cracked.
So mates what could be a reason? join was clean free of grease or anything els.
sz.barti wrote:Many thanx guys for quick respond.
TamJeff I have follow your advices and its ok many thanks, 2.4 filler is 2.4 mm (3/32) ally filler 4043 5% silicone. I have more plates to weld tomorrow so will try tacking up with gap instead of beveled it. Im using 3.2 mm (white tip) tungsten and when I turn the welder up to 250 amps tungsten get melted during the tacking why? I had AC balance set up around 80 % thats ok ? Or what could be the problem, I kept tungsten stick out around 3 mm over the gas dyfusor gas was setup around 20 l/min
Otto Nobedder wrote:I learned some hard lessons in tacking alumimum, which have been touched on here.
The two biggest things to bite me were: tacks too small...