Chapter 12 18. What is an advantage of vertical down welding? A. deep penetration B. fast groove filling C. thick sections D. very high rates of travel 19. What is the best method of metal transfer for overhead welding? A. direct metal transfer Review continued B. axial spray transfer C. globular transfer D. arc transfer 20. During overhead welding keeping the nozzle directly below the are flow.help prevent spatter from blocking the gas flow. A. true B. false

## Step1<br />For question 18, we need to identify the advantage of vertical down welding. The options provided are deep penetration, fast groove filling, thick sections, and very high rates of travel. The correct answer is deep penetration. This is because in vertical down welding, the electrode is fed downward, which allows for deeper penetration into the workpiece.<br /><br />## Step2<br />For question 19, we need to identify the best method of metal transfer for overhead welding. The options provided are direct metal transfer, axial spray transfer, globular transfer, and arc transfer. The correct answer is axial spray transfer. This is because axial spray transfer provides a stable and consistent metal transfer, which is ideal for overhead welding.<br /><br />## Step3<br />For question 20, we need to determine whether keeping the nozzle directly below the arc flow during overhead welding helps prevent spatter from blocking the gas flow. The options provided are true and false. The correct answer is true. This is because keeping the nozzle directly below the arc flow helps to direct the shielding gas more effectively, which can help prevent spatter from blocking the gas flow.