ANGULAR DISTORTION IN BUTT ARC WELDING

Abstract

The importance of fusion welding technology has been widely recognized in the manufacturing process of various steel structures such as ships, bridges, construction machines, power plants, and automobiles. However, a significant disadvantage of fusion welding is that it often generates unacceptable levels of geometric imperfections such as shrinkage and distortion. Angular distortion is a major problem and most pronounced among different types of distortion in the butt welded plates. This angular distortion is mainly caused by the non-uniform extension and contraction through thickness direction due to the temperature gradient. The principal factors affecting the degree of welding angular distortion are: material properties (the thermal expansion coefficient, the thermal conductivity and the specific heat), weld groove geometry, joint type and welding procedures (welding current, arc voltage, welding speed, shielding gas chemical composition, gas flow rate, welding gun angle, time gap between successive passes and number of passes). All these factors are explained in the paper.

The importance of fusion welding technology has been widely recognized in the manufacturing process of various steel structures such as ships, bridges, construction machines, power plants, and automobiles. However, a significant disadvantage of fusion welding is that it often generates unacceptable levels of geometric imperfections such as shrinkage and distortion. Angular distortion is a major problem and most pronounced among different types of distortion in the butt welded plates. This angular distortion is mainly caused by the non-uniform extension and contraction through thickness direction due to the temperature gradient. The principal factors affecting the degree of welding angular distortion are: material properties (the thermal expansion coefficient, the thermal conductivity and the specific heat), weld groove geometry, joint type and welding procedures (welding current, arc voltage, welding speed, shielding gas chemical composition, gas flow rate, welding gun angle, time gap between successive passes and number of passes). All these factors are explained in the paper.

Keywords

• Welding,distortion,Angular distortion

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