I am an engineer for a company that manufacturers industrial components that are painted to give corrosion resistance. We currently use the Gas Metal Arc Welding process and are having issues after painting, with the paint popping off along the weld seam. We have tracked the problem to the little slag islands that are on the surface of the weld. How can we eliminate or control the islands without blasting the parts prior to painting? What you are seeing on the surface of the weld is referred to as silicate islands.
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