How do you diagnose and troubleshoot common TIG weld defects in stainless steel butt joints (porosity, lack of fusion, undercut)?

How do you diagnose and troubleshoot common TIG weld defects in stainless steel butt joints (porosity, lack of fusion, undercut)?

• A. Inspect cleanliness and fit-up, confirm shielding gas coverage, verify electrolyte and filler compatibility, adjust current and travel speed, and ensure proper root opening and groove preparation.
• B. Focus only on increasing current until defect disappears.
• C. Porosity can be fixed after weld by grinding.
• D. Use the same filler and electrolyte as automotive applications.

Answer: (A)