CWB Level II with 100% correct answers graded A+ 2023/2024

CWB Level IIWhat 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 - correct answer (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 - correct answer (B) dark What is the Canadian Standard for safety in welding? - correct answer CSA W117.2 What is the typical three-phase input voltage in most Canadian welding shops? - correct answer 600V True or False: The cable from the workpiece back to the welding machine is called the "ground lead". - correct answer False. The correct term is the "work lead". What is the type of radiation that can damage living cells? - correct answer Ionizing Name two examples of ionizing radiation. - correct answer X-rays and Gamma rays What is the minimum suggested shade for a welding helmet when using 5/32 SMAW electrode at 150 A? - correct answer Shade 10 Approx. how far could spatter travel when welding/cutting from 2.5m high? - correct answer Possibly up to 6m What is the toxic component contained in some copper alloys? - correct answer Beryllium Which welding process will likely have the highest fume generation rate? [SMAW / SAW / FCAW] - correct answer FCAW What do the terms TLV and TWA stand for? - correct answer TLV: Threshold limit value TWA: Time weighted average Is helium lighter or heavier than air? - correct answer Lighter The action of UV light on oxygen produces which toxic gas? - correct answer Ozone Which common fuel gas has the widest range where it can become flammable when mixed with air? - correct answer Acetylene What substance should you NEVER apply to a stiff pressure-adjusting screw on an oxygen regulator? - correct answer Oil or grease What is the maximum gauge pressure that acetylene should be used? (kPa/psi) - correct answer 103 kPa (15 psi) Which toxic gas is produced when welding on surfaces with chlorinated hydrocarbon solvents? - correct answer Phosgene gas What is the typical max. OCV of an AC welding machine? - correct answer 80 V In an isometric drawing, the lines (for width, length and depth) are inclined at an angle of how many degrees? - correct answer 30° What are the maximum number of views in an orthographic drawing? - correct answer 6 What are the two general classes of picture drawings? - correct answer Perspective and Isometric What are the 5 basic joints? - correct answer 1) Butt 2) Corner 3) T 4) Lap 5) Edge What are the 5 basic weld types? - correct answer 1) Groove 2) Fillet 3) Plug/Slot 4) Surfacing 5) Edge Plasma cutting torch temp can reach temperatures of __________ ° Celsius. - correct answer 30,000 True or False: All plasma arc cutting equipment is operated using DCEN. - correct answer True True or False: Stainless steel can be readily cut with a normal oxy-fuel gas process. - correct answer False What are the two basic methods of plasma torch operation? - correct answer Transferred and Non-Transferred arc In North America, the 3 othographic views most commonly-used are: TOP, FRONT and __________ Side. [RIGHT / LEFT] - correct answer LEFT What is the difference between a "weld symbol" and a "welding symbol"? - correct answer A "weld symbol" indicates the specific kind of weld to be used (ex. fillet), and is contained inside of "welding symbol". In a welding symbol, is the size of the weld located to the LEFT or RIGHT of the fillet weld symbol? - correct answer LEFT