10 Welding Process & Design

Question 1

Welding method of in which the parts are to be initially heated by placing directly to fire of a forge

Answer 1

Forge welding

Question 2

The oldest and still most used source of heat for welding based on a chemical reaction is the burning of

Answer 2

Oxyacetylene

Question 3

Weld quality is improved by

Answer 3

Shielding gas

Question 4

In welding when the rod is negative the set up is called

Answer 4

Straight polarity

Question 5

In welding when the rod is positive, the set up is called

Answer 5

Reverse polarity

Question 6

The most versatile of all welding processes is

Answer 6

Arc welding

Question 7

A process more closely associated with pressure than fusion methods of welding and used only for making butt joints between the flat ends of work pieces without filler material

Answer 7

Percussive welding

Question 8

This process is used primarily for attaching threaded fastening devices in applications as shipbuilding

Answer 8

Stud welding

Question 9

Used to provide a gaseous shield that flushes away atmospheric gases to prevent oxidation and other gases contaminations of molten metal during the transfer from the rod after deposition in the molten pool

Answer 9

Coatings

Question 10

Coatings of this are commonly used for direct current welding rods

Answer 10

Sodium salt

Question 11

Coatings of this are commonly use for alternating current welding rods

Answer 11

Potassium salt

Question 12

Electrodes that are design with coatings that burn off slowly enough to support the rod at a proper distance above the work for good arc length with the less operator skill

Answer 12

Contact electrodes

Question 13

Welding method used to weld magnesium, titanium, stainless steel, is

Answer 13

Gas tungsten arc welding GTAW

Question 14

Welding process of this type have in common the use of a filler material in wire form, which is continuously fed into the weld metal pool, and a shielding gas, or mixture of gases, to provide the atmosphere

Answer 14

Gas metal arc welding GMAW

Question 15

Argon, helium, and carbon dioxide are used for

Answer 15

Welding gas shields

Question 16

Welding method used primarily for lap joints between flat sheets

Answer 16

Spot welding

Question 17

Welding method which a series of overlapping spot welds produce a continuous joint use primarily where pressure or liquid tightness is a requirement such as automotive gasoline tanks

Answer 17

Seam welding

Question 18

Welding process in which a stream of gas is ionized by heat as it passes through an electric arc. Used for metals such as aluminum

Answer 18

Plasma arc

Question 19

Welding method used to weld refractory metals such as beryllium

Answer 19

Electron beam welding

Question 20

Cold bonding may be performed with less deformation by applying high frequency mechanical energy in this welding process. And important assembly method for plastics

Answer 20

Ultrasonic welding

Question 21

The welding process, used most exclusively for making butt welds in heavy round sections, the bars and tubes are brought together with high forces while one is rotated

Answer 21

Friction welding

Question 22

Welding procedure used for coating or cladding, structural metal with a more expensive but more corrosive resistant metal

Answer 22

Explosion welding

Question 23

The actual shape of the bonded area or a cross-sectional shape of the filler material, frequently governed by the preparation given the edges of the part to be welded, is known as the type of

Answer 23

Weld

Question 24

Increased welding difficulty can be excepted as carbon or alloy content is increased in the steel with the exception of this element which reduces hardenability

Answer 24

Vanadium

Question 25

Post heat treating of stainless steel weldments is always required to restore maximum

Answer 25

Corrosion resistance

Question 26

The American Welding Society categorizes weld defects in three general classes

Answer 26

Dimensional, structural, and properties

Question 27

Differential heating and cooling sets up unequal stresses in the weld area that must be absorbed by

Answer 27

Warping, Deformation (plastic flow), or cracking if neither of the other can occur

Question 28

Pockets and voids that are the result of the same kind of chemical reactions that cause similar defects in castings

Answer 28

Porosity

Question 29

Slag, metal oxides, and non-metallic solids that are entrapped during welding are

Answer 29

Inclusions

Question 30

The result of melting base metal and not replacing it with weld metal leaving a notch or a grove is called

Answer 30

Undercut

Question 31

Usually caused by high stresses set up by localized dimensional changes in welds

Answer 31

Cracks

Question 32

Cracks in the weld metal are primarily of three types

Answer 32

Transverse, longitudinal, and multiple star shape crater tracks