A welder becomes unqualified when he has not welded in:

A welder becomes unqualified when he has not welded in:

• A. Three months.
• B. Twelve months.
• C. Six months.
• D. Nine months.

Answer: (C)

Continuity of welder qualifications matters because skills can drift with inactivity, so the code sets a clear time limit for keeping qualification active. In API 570, if a welder has not welded within six months, their qualification lapses and they are considered unqualified. They must then undergo requalification testing to prove they can still meet the required procedure, material, and position standards before welding on code-required joints again. This six-month threshold is the defined trigger; shorter or longer inactivity periods aren’t the standard trigger in API 570.

Continuity of welder qualifications matters because skills can drift with inactivity, so the code sets a clear time limit for keeping qualification active. In API 570, if a welder has not welded within six months, their qualification lapses and they are considered unqualified. They must then undergo requalification testing to prove they can still meet the required procedure, material, and position standards before welding on code-required joints again. This six-month threshold is the defined trigger; shorter or longer inactivity periods aren’t the standard trigger in API 570.