How to prevent deformation and relieve stress in butt welding machines?

The butt welding machine is subject to uneven heating and cooling during the welding process, causing the parts to be welded to have different degrees of thermal expansion and cooling contraction, resulting in stress and deformation. So how to prevent and eliminate it?

Measures to prevent and eliminate welding deformation:

The structural design should avoid dense intersection of welds, and the cross-section and length of the welds should be as small as possible. This is an effective measure to reduce deformation as well as preventing stress. When assembling before welding, use the anti-deformation method.

Rigid fixation method, but will produce large residual stress, adopt reasonable welding specifications; choose a reasonable welding sequence, symmetrical welding, segmented de-welding. Use mechanical or flame correction methods to reduce deformation.

Measures to prevent and eliminate welding stress:

The structural design should avoid dense intersection of welds, and the cross-section and length of the welds should be as small as possible; adopt a reasonable welding sequence to allow the welds to shrink more freely. When the welds are still at a relatively high temperature, hammer or roll the welds Elongate the metal and reduce residual stress;

Use small input energy welding and multi-layer welding to reduce residual stress. Preheating before welding can reduce the temperature difference of the workpiece and reduce residual stress. Perform stress relief annealing after welding to eliminate welding residual stress.