Determine the reasonable assembly sequence according to the structural form of the workpiece, so that the workpiece structure shrinks at the same position. Double sided groove shall be made at the neutral axis of the workpiece, multi-layer welding shall be adopted, and the double-sided welding sequence shall be determined. Intermittent welding is adopted in fillet weld, and the shrinkage in the first welding is balanced by the shrinkage in the second welding. The fixture can fix the workpiece at the required position, increase the rigidity and reduce the welding deformation. This method is widely used in the welding of small workpieces or small components. Due to the increase of welding stress, it is only suitable for low carbon steel structures with good plasticity.

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