Welding True and False Flashcards
In any welded structure it is desirable that butt joints should be used wherever possible.
true
Visual, radiographic, and ultrasonic examinations are common nondestructive testing methods.
true
Visual inspection of welds is routine procedure, and surface defects are quickly noticed by an experienced inspector.
true
It is easier to obtain watertightness and oiltightness with welded joints.
true
Riveted construction requires less skilled labor compared to a welded construction.
false
Fusion welding is achieved by means of a heat source which is intense enough to melt the edges of the material to be joined as it is traversed along the joint.
true
Gas welding, arc welding, and resistance welding all provide heat sources of sufficient intensity to achieve fusion welds.
true
The most common gas used to produce a high temperature flame in gas welding is Hydrogen.
false
In electric arc welding, the flux cored wires (FCAW) are often used in mechanized welding allowing higher deposition rates and improved quality of weld.
true
Stud welding may be classified as a shielded arc process, the arc being drawn between the stud (electrode) and the plate to which the stud is to be attached.
true
Gas shielded arc welding processes could be used for the welding of aluminum alloys.
true
In mild steel the weld tends to have a lower yield strength than the plate material.
false
Tungsten Inert Gas (TIG) is a welding process usually used for welding very thick steel plates (more than 10 mm).
false
The sequence of metal transfer in dip transfer process are: Establish the arc; wire fed into arc until it makes contact with plate; resistance heating of wire in contact with plate; pinch effect, detaching heated portion of wire as droplet of molten metal; Re-establish the arc.
true
In making a butt weld with manual arc welding, where the plate thickness exceeds 5 to 6 mm (~1/4”), it is necessary to make more than one welding pass to deposit sufficient weld metal to close the joint.
true
With higher current automatic welding processes, thicker plates may be welded with a single pass, but at greater thicknesses multi-pass welds become necessary
true
Fillet welds may be continuous or intermittent depending on the structural effectiveness of the member to be welded.
true
On thinner plates, it is necessary to bevel the edges of plates which are butted together to achieve complete penetration of the weld metal.
false
To reduce distortion and limit the residual stresses in the structure, it is important that a correct welding sequence be utilized throughout construction.
true
At T intersections it is necessary to weld the butt first fully, and then gouge out the ends to renew the seam edge preparation before welding the seam.
true
In repair work correct welding sequences are NOT important, and the procedure does NOT follow the general pattern for butts and seams in plate panels.
false
