CWB Level 2 Mod 9 Introduction to Welding Metallurgy of Steel 100% Solved

CWB Level 2 Mod 9 Introduction to Welding Metallurgy of Steel 100% Solved Exercise Question - Sections 1-4 During arc welding there is a zone adjacent to the weld metal that reaches high temperatures but does not melt. What is the name of this region? The heat affected zone Exercise Question - Sections 1-4 Not all the heat energy produced during welding will enter the plate as heat energy. What is this phenomenon known as? The efficiency Exercise Question - Sections 1-4 With manual welding the technique will influence the energy input. Of the following techniques which involves the higher energy input? a) weaving techniques b) depositing stringer beads a) weaving techniques Exercise Question - Sections 1-4 Considering that increasing the heat input will reduce the cooling rate, is the following statement true or false? For thick plates, the cooling rate is inversely proportional to the heat input True Exercise Question - Sections 4-8 The metallurgical changes that occur in the HAZ will be dependent on the peak _______________. The peak temperature reached Exercise Question - Sections 4-8 Regions that are close to the fusion boundary can experience temperatures sufficiently high enough that growth of the ___________________________________occurs. Austenitic grains Exercise Question - Sections 4-8 True or False One feature off hydrogen cracking is that it only occurs when the weld and heat affected zone are at high temperatures? False Exercise Question - Sections 4-8 True or False Welding over a gap in the backing bar of a complete penetration groove weld may result in a transverse crack in the weld metal? True Exercise Question - Sections 9-12 In the heat affected zone of a weld in carbon steel, fast cooling rates will form a hard ________________________________? Martensitic structure Exercise Question - Sections 9-12 Which of the following types of steel is the least susceptible to hydrogen cracking in normal circumstances? a) high strength, high hardness steels b) low strength, low hardness steels c) all steels have the same susceptibility to hydrogen cracking b) low strength, low hardness steels Exercise Question - Sections 9-12 True or False The carbon equivalent formula available in CSA W59 is one of several possible formulas available. True Exercise Question - Sections 9-12 Which cracking susceptibility test uses plates of different thicknesses to change the cooling rate? Controlled Thermal Severity Exercise Question - Sections 13-17 True or False Solidified weld metal will have a micro-structure the same as that of the parent material (plate) False Exercise Question - Sections 13-17 The proportion of parent metal melted into weld is known as the _______________________________ Dilution Exercise Question - Sections 13-17 Arc fluxes that do not easily transfer oxygen to the weld metal are referred to as what type of flux? Basic Fluxes Exercise Question - Sections 18-22 What effect does the presence of large quantities of oxides have on the charpy- V- notch impact energy? It is likely to be lower Exercise Question - Sections 18-22 What type of weld pool does high welding speed produce? A long weld pool Exercise Question - Sections 18-22 Centreline solidification cracking is most likely caused by welding speed that is too: a) high b) low a) high Exercise Question - Sections 18-22 When a carbon steel weldment is stress relieved at 625 Celsius are there any major changes in the micro-structure? No