Causes of welding deformation of ASTM A36 I beam steel

The fundamental cause of ASTM A36 I beam steel welding deformation is the inhomogeneity of welding heat field. During welding, compression plastic deformation occurs in the high temperature zone, and the shrinkage of this ASTM A36 I beam steel part is prevented by other parts after welding, which results in welding residual stress and deformation.

Flange angle deformation in ASTM A36 I beam steel. Because of the uneven heating on the front and back of the flange caused by the weld between the upper and lower flange and web, the angular deformation of the flange is produced.

ASTM A36 I beam steel web instability. There are two main reasons for the formation of the web compressive stress: in ASTM A36 I beam steel the welding process, the longitudinal shrinkage of the fillet weld between the flange and the web produces the residual compressive stress on the web. As a result, a portion of the web in the mounting joint area is actually subjected to bidirectional compressive stress.

Other deformation. It mainly includes sidebending, arched and twisted deformation of ASTM A36 I beam steel, which is caused by gas cutting and unreasonable welding sequence. Once such welding deformation exceeds the standard requirements, it is very difficult to rectify. Sometimes the whole ASTM A36 I beam steel workpiece must be cut and re-welded, and even the whole workpiece scrapped, resulting in huge economic losses and time delays. In construction, technical measures should be taken to avoid such deformation.

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