10 Welding Process & Design Flashcards Preview

Materials And Processing For NDT > 10 Welding Process & Design > Flashcards

Flashcards in 10 Welding Process & Design Deck (32)
Loading flashcards...
1
Q

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

A

Forge welding

2
Q

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

A

Oxyacetylene

3
Q

Weld quality is improved by

A

Shielding gas

4
Q

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

A

Straight polarity

5
Q

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

A

Reverse polarity

6
Q

The most versatile of all welding processes is

A

Arc welding

7
Q

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

A

Percussive welding

8
Q

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

A

Stud welding

9
Q

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

A

Coatings

10
Q

Coatings of this are commonly used for direct current welding rods

A

Sodium salt

11
Q

Coatings of this are commonly use for alternating current welding rods

A

Potassium salt

12
Q

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

A

Contact electrodes

13
Q

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

A

Gas tungsten arc welding GTAW

14
Q

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

A

Gas metal arc welding GMAW

15
Q

Argon, helium, and carbon dioxide are used for

A

Welding gas shields

16
Q

Welding method used primarily for lap joints between flat sheets

A

Spot welding

17
Q

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

A

Seam welding

18
Q

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

A

Plasma arc

19
Q

Welding method used to weld refractory metals such as beryllium

A

Electron beam welding

20
Q

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

A

Ultrasonic welding

21
Q

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

A

Friction welding

22
Q

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

A

Explosion welding

23
Q

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

A

Weld

24
Q

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

A

Vanadium

25
Q

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

A

Corrosion resistance

26
Q

The American Welding Society categorizes weld defects in three general classes

A

Dimensional, structural, and properties

27
Q

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

A

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

28
Q

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

A

Porosity

29
Q

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

A

Inclusions

30
Q

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

A

Undercut

31
Q

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

A

Cracks

32
Q

Cracks in the weld metal are primarily of three types

A

Transverse, longitudinal, and multiple star shape crater tracks