CWB Electrodes and Consumables (Practice Test Questions and answers )

According to the AWS, the nominal composition of a brown colour-coded tungsten electrode is: - tungsten and 0.25% zirconium oxide (pure tungsten is green) Alloyed tungsten electrodes have some advantages over pure tungsten electrodes. The following is not one of those advantages: - lower electrode cost Spray, globular and short-circuiting are terms used in GMAW welding to describe - mode of metal transfer through the arc The usable position for GMAW wires is not specified in the classification because it depends on: - a. the shielding gas b. the wire diameter c. the mode of metal transfer CSA standard W59 requires that the electrode holding ovens for low-hydrogen electrodes be kept at a minimum temperature of: - 120°C When improved mechanical properties (toughness) of the weld metal deposit are required, the flux should be formulated to transfer the smallest possible quantity of: - Oxygen When manufacturing fused fluxes, the temperature at which the ingredients are melted together is: - 1,500°C to 1,700°C An electrode that is to be used with DC electrode positive current only is: - E4910 The result of increased nitrogen content in the final weld deposit will be: - PorosityGenerally, as the percentage of carbon dioxide in an argon gas mixture decreases, the final weld deposit will have: - increased strength properties due to a higher manganese and silicon content Electrode holding ovens are recommended for: - low-hydrogen electrodes The primary function of cellulose as a coating ingredient is to provide: - gaseous protection A stainless steel electrode with the designation E316-25 would be a(n): - basic flux electrode usable for flat grooves and horizontal fillets only True or false; Filler metal rods used for gas tungsten arc welding are covered by CSA standard 48. - True True or false; The impact toughness of the weld deposit required for the B-G 49A 3C G6 (ER49S-6) electrode is not specified. - False According to CSA W48, the minimum yield strength required by the as-welded deposit of solid carbon steel filler metals for gas shielded arc welding is: - 400 MPa True or false; The addition of cellulose to an electrode coating will improve the weld's ductility. - True True or false; Today, most mild steel electrodes have a wire core composed of semi-killed steel. - False In medium coated electrodes, the percentage of the electrode weight derived from the coating is: - 20% to 35% The main functions of slag include - a. reducing the amount of oxygen and other impurities in the weld b. controlling the bead shape and smoothnessc. protecting the weld metal from contamination