Increase current density and increase the arc stop period. Using a longer arc may also increase its chances. If there is any slag in the weld, then it affects the toughness and metal weldability of the given material. Improper welding angle and travel rate of welding rod.
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It occurs in materials such as nickel base alloys, stainless steel, carbon steels and Tin alloys.
Insufficient cleaning between multi-pass welds and incorrect electrode and current can leave slag and unfused section along wellding weld joint. Welding defects are formed during welding process In the common types of weld defects, crack is the most dangerous form and almost all standards do not accept the appearance of crack.
Types of welding defects and remedies
By using large electrodes this defect may occur. This causes a stress and then crack is formed. If the arc voltage is very high then this defect may occur. This is all about welding defects types and testing.
Welding Defects : Types, Causes, Testing and Remedies
Welding current density is too small ,which is difficult to provide enough heat for molten metal and it leads to the fact that slag might be impossible to float on the weld surface.
In this types of welding defect gap is not totally filled by molten metal.
Today we will learn about all types of welding defects. Crack can occur at different temperatures: What is Arc Welding? It is common type. In this condition the weld metal rolls and forms an angle less than 90 degrees. Reducing the arc length and welding current 2.
Reduce weldimg gap between the weld joints by using reasonable weld joints. The majority of weld testing and inspection can be separated into two categories.
Cracks may occur in various location and direction in the weld area. Proper selection of the electrode.
It lends its dfeects to mass produced parts, where sacrificing one or two component for testing is acceptable. It occurs because of the low heat input. It is quite useful for setting up welding equipment.
Such defects are called welding defects. Subscribe our website for more informative articles. Welding disabilities are the deviations in shape and size of the metal structure compared to design standards and technical requirements, which reduces their durability and productivity.
Welds existing porosities will reduce their weldign and tightness. When the weld pool is very large and runs ahead of the arc.
Handbook - Weld Defects
The defect may differ from the desired weld bead shape, size, and intended quality. Incomplete fusion occurs when the welder does not accurately weld the material and the metal pre solidifies which anx to a gap which is not filled with the molten metal. Metal drop expelled from the weld that stick to surrounding surface is known as spatter. Different Types of Welding Joints. This defect can only be repaired by grinding down or gouging out and re-welding.
If you have any query regarding this article ask by commenting below. It is a defect in which several passes are made along a V-joint when joining thick plate using flux cored or flux coated rods and the slag covering a run is not totally removed every pass before following pass.
Florescent penetration testing is advance ad of dye penetration testing. Less deposition of the weldint metal 2. Using a proper welding technique reduce the chances of necklace cracking.