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Lasor Welding porosity

Lasor Welding porosity

Lasor Welding porosity

(OP)
Recently, I am assigned a project to find reason why our lasor welded part has porosity in the welding bead. Under the microscope, gas bubbles are as large as 5/1000''. The porosity usually exists at the boundary between the bead and the substrate.

As I have little experience with welding porosity anslysis. My questions are: Is there any general reasons that porosity formulate during the welding process? Is there any papers, books devoted specifically to welding porosity?

Thanks in advance

RE: Lasor Welding porosity

What are the materials being joined?  How were they fabricated?  Are the parts cleaned prior to welding?

RE: Lasor Welding porosity

(OP)
The material is stainless steel. The substrate surface is milled and grinded. The bead is cold drown stainless steel wire. Surface are all cleaned before welding.

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