CWB Level II Key Points Review Questions and Answers

What is the term used to describe the following condition of lost corrosion resistance? "When certain stainless steels are heated between 500-850° C, carbides form at the grain boundaries and cause a local depletion of chromium." (A) Oxidization (B) Increased toughness (C) Solution heat treatment (D) Sensitization (D) Sensitization Note: Also known as "carbide precipitation" -- Chromium binds to carbides, and "sweats out" at the grain boundaries On a radiograph, undercut appears as a _________ line. (A) light (B) dark (B) dark What is the Canadian Standard for safety in welding? CSA W117.2 What is the typical three-phase input voltage in most Canadian welding shops? 600V True or False: The cable from the workpiece back to the welding machine is called the "ground lead". False. The correct term is the "work lead". What is the type of radiation that can damage living cells? Ionizing Name two examples of ionizing radiation. X-rays and Gamma rays What is the minimum suggested shade for a welding helmet when using 5/32 SMAW electrode at 150 A? Shade 10 Approx. how far could spatter travel when welding/cutting from 2.5m high? Possibly up to 6m What is the toxic component contained in some copper alloys? Beryllium Which welding process will likely have the highest fume generation rate?