Dear Experts,

We encountered problem of porosity ( size 2 - 3 mm dia ) like holes on surface of weld bead and local depth depression marks ( size 4 - 6 mm ) on the surface of weld bead. Even when removed slag is broken, it is found that slag cross section is not solid throughout but some voids, bubble like voids pockets were found in slag. When I searched for solution for this defect, I could not find any authenticated literature or article having information regarding the same. Going through opinions of welding experts in discussion web forums, I come to know that this defect is pock mark defect d caused due to limited scope to escape for the gas produced during welding and it is trapped causing pock mark porosity. I could find for corrective actions like increase current ampere and reduce travel speed to increase heat input, reduce flux height. I implemented these corrective actions and found success in defect free welding. This was practical approach to solve the problem.

But I am looking for a literature or article for pock mark porosity defect in SAW welding with fused flux. I would be thankful, if anybody can share me such literature or article having information for the same on my mail id :   mayur211092@gmail.com

mayur211092@gmail.com

Thank you.