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)