CWS Welding Safety & Quality Control

Question 1

Per ANSI Z49.1 and NFPA 51B, combustible materials that cannot be protected should be relocated at least how far from a hot work location?

Accepted Answer

35 ft (11 m)

Answer

The 35 ft (11 m) rule is the standard radius for removing or protecting combustibles around hot work.

Question 2

Under OSHA 1910.253, stored oxygen cylinders must be separated from fuel-gas cylinders by a minimum of 20 ft or by a noncombustible barrier of what height?

Accepted Answer

5 ft

Answer

OSHA requires 20 ft separation or a noncombustible barrier at least 5 ft high with a half-hour fire-resistance rating.

Question 3

Acetylene should never be used at a withdrawal pressure exceeding which value?

Accepted Answer

15 psig

Answer

Above 15 psig, acetylene becomes unstable and can decompose explosively.

Question 4

According to the AWS F2.2 lens shade selector, what is the suggested shade number for SMAW using a 3/16 in. electrode?

Accepted Answer

Shade 12

Answer

For 5/32–1/4 in. electrodes, the minimum shade is 10 and the suggested comfort shade is 12.

Question 5

Under AWS D1.1, which party is responsible for qualifying the WPSs and the welding personnel used on the job?

Accepted Answer

The Contractor

Answer

D1.1 puts responsibility for WPS and welder qualification on the Contractor, while the Engineer may accept or require verification.

CWS - Certified Welding Supervisor Practice Test

CWS - Certified Welding Supervisor Practice Test

CWS Welding Safety & Quality Control