AWS Safety & Welding Standards 3

Question 1

What does the term 'lockout/tagout' (LOTO) refer to in a welding shop context?

Accepted Answer

A procedure to de-energize and secure equipment before maintenance

Answer

LOTO (OSHA 29 CFR 1910.147) is an energy control procedure that de-energizes and physically locks equipment before maintenance to prevent accidental startup.

Question 2

According to AWS Z49.1, a 'hot work permit' is required when:

Accepted Answer

Performing welding in areas with fire or explosion hazards

Answer

AWS Z49.1 requires a hot work permit before conducting welding or cutting in locations where fire or explosion risks are present.

Question 3

Which AWS standard governs the qualification of welding procedures and welders for piping and tubing?

Accepted Answer

AWS B2.1

Answer

AWS B2.1 covers the specification for welding procedure and performance qualification applicable to a broad range of base metals including piping.

Question 4

When storing compressed gas cylinders in a welding area, AWS and OSHA require that oxygen and fuel gas cylinders be separated by at least:

Accepted Answer

10 feet or a 5-foot fire wall

Answer

OSHA 1910.253 requires oxygen and fuel gas cylinders in storage to be separated by at least 20 feet or by a noncombustible barrier at least 5 feet high with a fire rating of 0.5 hour.

Question 5

AWS standards classify welding fumes containing hexavalent chromium (Cr VI) as particularly hazardous because Cr VI is:

Accepted Answer

A known human carcinogen

Answer

Hexavalent chromium is classified as a known human carcinogen by IARC and OSHA, requiring strict exposure controls during stainless steel welding.

AWS Practice Test

AWS Practice Test

AWS Safety & Welding Standards 3