CWB Level II Exam Questions with Correct Answers

CWB Level II Exam Questions with Correct 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 - 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 - Answer-(B) dark What is the Canadian Standard for safety in welding? - Answer-CSA W117.2 What is the typical three-phase input voltage in most Canadian welding shops? - Answer-600V True or False: The cable from the workpiece back to the welding machine is called the "ground lead". - Answer-False. The correct term is the "work lead". What is the type of radiation that can damage living cells? - Answer-Ionizing Name two examples of ionizing radiation. - 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? - Answer-Shade 10 Approx. how far could spatter travel when welding/cutting from 2.5m high? - AnswerPossibly up to 6m What is the toxic component contained in some copper alloys? - Answer-Beryllium Which welding process will likely have the highest fume generation rate? [SMAW / SAW / FCAW] - Answer-FCAW What do the terms TLV and TWA stand for? - Answer-TLV: Threshold limit value TWA: Time weighted average Is helium lighter or heavier than air? - Answer-Lighter The action of UV light on oxygen produces which toxic gas? - Answer-Ozone Which common fuel gas has the widest range where it can become flammable when mixed with air? - Answer-Acetylene What substance should you NEVER apply to a stiff pressure-adjusting screw on an oxygen regulator? - Answer-Oil or grease What is the maximum gauge pressure that acetylene should be used? (kPa/psi) - Answer-103 kPa (15 psi) Which toxic gas is produced when welding on surfaces with chlorinated hydrocarbon solvents? - Answer-Phosgene gas What is the typical max. OCV of an AC welding machine? - Answer-80 V In an isometric drawing, the lines (for width, length and depth) are inclined at an angle of how many degrees? - Answer-30° What are the maximum number of views in an orthographic drawing? - Answer-6 What are the two general classes of picture drawings? - Answer-Perspective and Isometric What are the 5 basic joints? - Answer-1) Butt 2) Corner 3) T 4) Lap 5) Edge What are the 5 basic weld types? - Answer-1) Groove 2) Fillet 3) Plug/Slot 4) Surfacing 5) Edge Plasma cutting torch temp can reach temperatures of __________ ° Celsius. - Answer30,000 True or False: All plasma arc cutting equipment is operated using DCEN. - Answer-True True or False: Stainless steel can be readily cut with a normal oxy-fuel gas process. - Answer-False What are the two basic methods of plasma torch operation? - Answer-Transferred and Non-Transferred arc In North America, the 3 othographic views most commonly-used are: TOP, FRONT and __________ Side. [RIGHT / LEFT] - Answer-LEFT What is the difference between a "weld symbol" and a "welding symbol"? - 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? - Answer-LEFT In a welding symbol, is the length of the weld located to the LEFT or RIGHT of the fillet weld symbol? - Answer-RIGHT In what direction do the electrons flow in an electrical arc? (A) anode --> cathode (B) cathode --> anode - Answer-(B) cathode --> anode In arc welding, the arc temperature can exceed temperatures of __________ ° Celsius? - Answer-30,000