Chap 30 joining processes

Question 1

The combining of individual parts in order to make an overall product

Answer 1

joining

Question 2

The melting together and coalescing of materials by means of heat; the joining together of two parts by the application of heat, which melts and fuses the interface; the operation is sometimes assisted by a filler material

Answer 2

fusion welding

Question 3

Metal added to the weld area during welding; it is usually available in the form of a filler rod or wire

Answer 3

filler material

Question 4

General term used to describe any welding process that uses a fuel gas combined with oxygen to produce a flame; the flame is the source of heat that is used to melt the metals at the joint; the equipment for this process consists of a welding torch connected by hoses to high-pressure gas cylinders and equipped with pressure gauges and regulators;

Answer 4

oxyfuel gas welding

Question 5

Exothermic welding process, involves mixing of metal powder (FeO) with a metal oxide (Al2O3), then using a high temperature ignition source to cause an oxidation-reduction reaction; temperature can reach upto 2500 deg C, melting iron, which subsequently flows into a pouring basin and then into a mold placed around the parts to be welded

Answer 5

thermite welding

Question 6

Type of flame in oxyacetylene gas welding in which the ratio of acetylene to oxygen is 1:1

Answer 6

neutral flame

Question 7

Peak tensile stresses develop in the following region of weldment

Answer 7

fusion zone

Question 8

Portion of the base metal with properties that have been altered by its proximity to the weld metal during a fusion welding process

Answer 8

heat affected zone

Question 9

Non-consumable electrode arc welding process

Answer 9

gas tungsten arc welding

Question 10

Substance used to retard oxidation of the surface of the parts being welded by generating a gaseous shield around the weld zone

Answer 10

flux