Flashcards
Chapter 29
Cards in this deck (13)
- 1What were the two discoveries of Sir Humphrey Davy that led to the development of modern welding technology?The two discoveries of Sir Humphrey Davy were (1) the electric arc and (2) acetylene gas.
- 2What is meant by the term faying surface?The faying surfaces are the contacting surfaces in a welded joint.
- 3Define the term fusion weld.A fusion weld is a weld in which the metal surfaces have been melted in order to cause coalescence.
- 4What is the fundamental difference between a fusion weld and a solid state weld?In a fusion weld, the metal is melted. In a solid state weld, the metal is not melted.
- 5What is an autogenous weld?An autogenous weld is a fusion weld made without the addition of filler metal.
- 6Name and sketch the five joint types.Five joint types are (1) butt, (2) corner, (3) lap, (4) tee, (5) edge. For sketches see Figure 28.3 in the text.
- 7Define and sketch a fillet weld.A fillet weld is a weld joint of approximately triangular cross section used to fill in the edges of corner, lap, and tee joints.
- 8Define and sketch a groove weld.A groove weld is a weld joint used to fill in the space between the adjoining edges of butt and other weld types except lap.
- 9Why is a surfacing weld different from the other weld types?Because it does not join to distinct parts, but instead adds only filler metal to a surface.
- 10Why is it desirable to use energy sources for welding that have high heat densities?Because the heat is concentrated in a small region for greatest efficiency and minimum metallurgical damage.
- 11What is the unit melting energy in welding, and what are the factors on which it depends?The unit melting energy is the amount of heat energy required to melt one cubic inch or one cubic mm of metal. The factors on which it depends are (1) specific heat, (2) melting point, and (3) heat of fusion of the metal.
- 12Define and distinguish the two terms heat transfer factor and melting factor in welding.Heat transfer factor is the ratio of the actual heat received at the work surface divided by the total heat generated by the source. Melting factor is the ratio of heat required for melting divided by the heat received at the work surface.
- 13What is the heat-affected zone (HAZ) in a fusion weld?The HAZ is a region of base metal surrounding the fusion zone in which melting has not occurred, but temperatures from welding were high enough to cause solid state microstructural changes.
Information
- Description
- ISE 2500 Flashcards on Chapter 29, created by Brandon Alcaraz on 29/04/2013.
- Created by
- Brandon Alcaraz · Apr 2013
- Updated
- Feb 19, 2016
- Views
- 77
- Tags
- Rating