Thanks again btrueblood, mbt22 and Duwe6!
All of you are providing great tips on how to stop the porosity but as I already stated twice, "The problems isn't getting rid of the porosity. The only thing we did to get rid of it was "snoop" and tighten the fittings and eliminate all leaks. Since we...
Hi btrueblood, Thanks for your efforts again. The current metal that was exhibiting the porosity was A53 and A106 Gr. B. It was ground with abrasive wheels to remove all surface impurities and then cleaned with acetone just prior to welding. We have QC inspections on cleanliness. For GTAW we...
Hi btrueblood, I'm sure we had porosity. A lot of very fine pores scattered throughout the weld. They were so fine they passed radiography and sheer wave ultrasound but when sectioned and polished they were visible. I'm also sure that the only thing we did to get rid of it was "snoop" the...
Thanks Compositepro!
But my question was more general than the solution you are trying to provide. We already solved the porosity issues by sealing every leak in the argon systems. They were detected using liquid leak detector. There are two, one for the torch and one for the hotwire heating...
My company manufactures automated welding systems. In our TIG system we preheat the filler wire with an electric current, the wire feed tube uses Argon to prevent the filler wire from oxidizing prior to entering the weld pool. Even though the feed tube is slightly above atmospheric pressure it...
Thanks "unclesyd" but I must not have been clear. We weld all types of material, i.e., carbon steel (A106, A53...), stainless steel (304, 316...), chrome-moly (P11, P22, P91). Generally they are welded to the same type of material, i.e., A106 to A106. I was told that copper can contaminate the...
I have been told that copper contamination can be the cause of cracks in welds. Is this true? Is this specific to a type of metal? If it does cause cracks why is copper used so commonly around welded components? I.e., GTAW collets, GMAW contact tips and nozzles, pipeline backup shoes for the...
