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Defects related to fracture. Arc strike crackings[ edit ] Arc strike cracking occurs when the arc is struck but the spot is not welded. This occurs because the spot is heated above the material’s upper critical temperature and then essentially quenched.
This forms martensite , which is brittle and may lead to higher chances of micro-cracks. Usually the arc is struck in the weld groove so this type of crack does not occur, but if the arc is struck outside of the weld groove then it must be welded over to prevent the cracking.
If this is not an option then the arc spot can be postheated, that is, the area is heated with an oxy-acetylene torch , and then allowed to cool slowly. Cold cracking is limited to steels and is associated with the formation of martensite as the weld cools. The cracking occurs in the heat-affected zone of the base material. To reduce the amount of distortion and residual stresses, the amount of heat input should be limited, and the welding sequence used should not be from one end directly to the other, but rather in segments.
This causes the outer edges of the crater to cool more quickly than the crater, which creates sufficient stresses to form a crack. The crack starts at the fusion line and extends up through the weld. They are usually caused by too much voltage or not enough speed. To diminish the probability of this type of cracking, excess material restraint should be avoided, and a proper filler material should be utilized. The exact causes of this type of crack are not completely understood, but it is known that dissolved hydrogen must be present.
The other factor that affects this type of crack is internal stresses resulting from: There are three types: Check cracks are visible from the surface and extend partially into the weld. They are usually caused by high shrinkage stresses , especially on final passes, or by a hot cracking mechanism. Root cracks start at the root and extent part way into the weld. They are the most common type of longitudinal crack because of the small size of the first weld bead. If this type of crack is not addressed then it will usually propagate into subsequent weld passes, which is how full cracks a crack from the root to the surface usually form.
The phenomenon has also been observed in austenitic stainless steels. It is caused by the poor creep ductility of the heat affected zone. Any existing defects or notches aggravate crack formation.
Things that help prevent reheat cracking include heat treating first with a low temperature soak and then with a rapid heating to high temperatures, grinding or peening the weld toes, and using a two layer welding technique to refine the HAZ grain structure.
Major reason for happening of these types of cracks is hydrogen embrittlement. These types of defects can be eliminated using high current at the starting and proper filler material. Toe crack occurs due to moisture content present in the welded area,it as a part of the surface crack so can be easily detected. Preheating and proper joint formation is must for eliminating these types of defects. Transverse crack[ edit ] Transverse cracks are perpendicular to the direction of the weld.
These are generally the result of longitudinal shrinkage stresses acting on weld metal of low ductility. Crater cracks occur in the crater when the welding arc is terminated prematurely. Crater cracks are normally shallow, hot cracks usually forming single or star cracks.
These cracks usually start at a crater pipe and extend longitudinal in the crater. However, they may propagate into longitudinal weld cracks in the rest of the weld. Distortion[ edit ] Welding methods that involve the melting of metal at the site of the joint necessarily are prone to shrinkage as the heated metal cools. Shrinkage then introduces residual stresses and distortion. Distortion can pose a major problem, since the final product is not the desired shape.
To alleviate certain types of distortion the workpieces can be offset so that after welding the product is the correct shape.
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