WCL Safety Standards & Regulations 4

Question 1

What hazard is created when welding is performed near degreasing solvents or chlorinated hydrocarbons such as trichloroethylene?

Accepted Answer

Phosgene gas formation from UV arc decomposition of the solvent

Answer

UV radiation from the welding arc can decompose chlorinated solvents into phosgene, a highly toxic gas.

Question 2

Under Los Angeles city fire code, a hot work permit for welding inside a building must be posted where during the work?

Accepted Answer

At the worksite, visible to workers and inspectors

Answer

Hot work permits must be posted at the actual work location so all workers and fire inspectors can verify authorization.

Question 3

Which OSHA standard specifically requires employers to conduct atmospheric testing before and during welding in a permit-required confined space?

Accepted Answer

29 CFR 1910.146

Answer

OSHA 29 CFR 1910.146 governs permit-required confined spaces and mandates atmospheric testing before entry and continuously during work.

Question 4

What does the acronym 'SDS' stand for in the context of welding hazard communication?

Accepted Answer

Safety Data Sheet

Answer

SDS stands for Safety Data Sheet, which provides hazard information for chemicals and materials encountered in welding.

Question 5

According to AWS F4.1, before welding or cutting is performed on a container that held flammable or combustible material, the container must be:

Accepted Answer

Cleaned and purged to remove all residue and tested to confirm safe atmosphere

Answer

AWS F4.1 requires thorough cleaning, purging, and atmospheric testing to confirm the container is safe before any hot work.

(WCL) Welding Certification Los Angeles Practice Test