72_Welding Distortion.pdf
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Welding Distortion When metal is heated it expands and when it is cooled it contracts.(expansion and contraction) Distortion is caused by the uneven heating and cooling of metal. Welding always causes distortion. It is important for the person performing the welding operation to be aware of the three main types of distortion and how they can be controlled. Angular Distortion is created when welding a “tee” joint. If a weld is deposited on one side only, the results will be that the vertical plate will be pulled from 90 degrees toward the welded side. Lateral Distortion is created when welding plates side by side. The expansion and contraction is across the weld. As the weld continues along the length of the plates the plates pull inward. The plates will scissor or overlap onto each other. Longitudinal Distortion can also occur when welding plates side by side and when the weld is deposited on one side only. The expansion and contraction is along the length of the plate. A curling action will pull the plate upward toward the weld. Questions; 1. What happens when metal is heated?. 2. What causes distortion? 3. How can distortion be controlled?
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Transcript of 72_Welding Distortion.pdf
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Welding DistortionWhen metal is heated it expands and when it iscooled it contracts.(expansion and contraction)Distortion is caused by the uneven heating andcooling of metal. Welding always causesdistortion. It is important for the person performingthe welding operation to be aware of the three maintypes of distortion and how they can be controlled.
Angular Distortion is created when welding a teejoint. If a weld is deposited on one side only, theresults will be that the vertical plate will be pulledfrom 90 degrees toward the welded side.
Lateral Distortion is createdwhen welding plates side byside. The expansion andcontraction is across the weld.As the weld continues alongthe length of the plates theplates pull inward. The plateswill scissor or overlap ontoeach other.
Longitudinal Distortion canalso occur when welding plates side by sideand when the weld is deposited on one sideonly. The expansion and contraction is alongthe length of the plate. A curling action willpull the plate upward toward the weld.
Questions;
1. What happens when metal is heated?. 2. What causes distortion?3. How can distortion be controlled?
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