Safety & Welding Standards Flashcards

According to AWS Z49.1, what is the minimum air change rate required in a confined space during welding?

Answer: 6 air changes per hour

AWS Z49.1 requires a minimum of 6 air changes per hour in confined spaces to maintain safe ventilation during welding.

What ANSI/AWS standard specifically addresses safety in welding, cutting, and allied processes?

Answer: AWS Z49.1

AWS Z49.1 is the primary standard titled 'Safety in Welding, Cutting, and Allied Processes.'

When welding on containers that held flammable materials, AWS standards require the welder to:

Answer: Fill the container with water or inert gas before welding

AWS Z49.1 mandates that containers previously holding flammables be purged with water or inert gas to eliminate explosion risk.

Which eye protection shade is generally recommended for shielded metal arc welding (SMAW) at currents between 75–200 amps?

Answer: Shade 10

ANSI/AWS guidelines recommend shade 10 lens for SMAW operations in the 75–200 amp range.

Under OSHA 1910.252, what is the maximum allowable iron oxide fume concentration in the welder's breathing zone?

Answer: 5 mg/m³

OSHA's permissible exposure limit (PEL) for iron oxide fume is 5 mg/m³ as an 8-hour time-weighted average.

AWS D1.1 structural welding code defines a 'qualified welder' as one who has:

Answer: Passed a performance qualification test per the code

AWS D1.1 defines qualification strictly through successful completion of prescribed performance tests documented by test records.

Which of the following is a primary hazard associated with ozone gas generated during GMAW of aluminum?

Answer: Pulmonary edema from inhalation

Ozone generated by UV arc radiation reacting with oxygen can cause pulmonary edema (fluid in the lungs) if inhaled in sufficient concentration.