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I am doing 2-inch with a quarter inch root and a quarter inch backing bar.Using 70/18 excaliber rod. Everything is cleaned, and pre-heating weld. After ultra sound, and sstill having cracks at root pass. Any help or tips would be greatly appreciated. Thank you.
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Are you getting good fusion with the backing plate? Are your lo-hy electrodes kept in an oven all the time at atleast 250 Deg. F.? Is this a highly restrained joint? How high is your preheat? What material are you welding? The most likely scenario is your electrodes are contaminated and the preheat is not high enough for 2" steel. Please check these things and write back on Monday.Respectfully,
Mike Sherman
Shermans Welding -
I bet it isnt really cracks but could be incomplete fusion with the backing bar. Did you cut one open or are you taking the test for the word? If the bar isnt fit right it will read funny also. I have seen where backing strips not being fit tight in behind cause funny readings too. That test is really dependant on operator skill also and a guys first week on the job could cause problems. Cut one open and see whats the deal.Comment
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moment connections
Badboy: I'am curious, are these cracks only in the root pass? If they are could it be slag inclusions between backing plate and coupon? With 7018 it will do that at times. StuComment
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Welcome to the forum, BB...sounds like LOF rather than cracks....did they remove the backer before U/S ? How wide was your root gap before welding? Were you sure of the material designation of the backer? I like to have a ample root opening so that I can point the rod into the corner, one side at a time as I weave along. What position were you doing?
More info will help us diagnose better.Comment
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