A New Tube Sheet Welding Method

Abstract

Provided is a new tube plate welding method. The new tube plate welding method is characterized in that aiming at connecting objects which includes a tube and a plate, welding between the tube and the plate is achieved through adoption of a rotary welding set and modes of friction, stir and upsetting. According to the welding set, a working end of the welding set is composed of a ball head, a neck portion and shoulder portions in a connection mode in sequence, the diameter of the ball head is in interference fit with the inner diameter of the tube, the diameter of a peak of a fourth arc section on each shoulder portion is larger than the outer diameter of the tube, and a projection distance between the peak of the ball head and the peak of the fourth arc section on each shoulder portion in the axis direction is less than the thickness of the plate. The new tube plate welding method comprises the welding steps that (1) the tube is fixed with the plate in a support mode; (2) the ball head is inlaid into the tube; (3) the welding set rotates, and carries out circular pendulum motion and axial reciprocating motion at the same time, and therefore plastic deformation of materials of a combination portion between the plate and the tube is carried out; and (4) the welding set exits from the tube and the plate. The new tube plate welding method is applicable to welding between a thin wall tube and a thick plate, and has the advantages of being free from solder and scaling powder, high in welding intensity, environment-friendly, small in residual stress and deformation of a structure after welding, and the like.

Description

technical field [0001] The invention relates to a welding method, in particular to a tube plate welding method. The tube-sheet welding method is a solid-phase welding method similar to friction stir welding, which is specially used for butt pipes and plates. Background technique [0002] In the prior art, argon arc welding is usually used for welding tubes and plates. Argon arc welding requires solder, which is made of different materials from the masterbatch and has low strength. Moreover, due to the large heat-affected area during welding, the structure after welding The residual stress is large and easy to deform. [0003] In addition, there is a welding method called friction stir welding in the prior art. Friction stir welding is to extend the protruding section of a welding tool into the joint of the workpiece. Through the high-speed rotation of the welding tool, the protruding section of the welding tool rubs and stirs inside the material, and the shoulder of the we...

AI Technical Summary

Problems solved by technology

If the friction stir welding is used to weld the pipe and plate, the welding tool should make a circular motion around the circumference of the pipe during welding. For the pipe with a wall thickness of 7.5mm, the depth of the weld after welding can reach 3-5mm at most, so the welding strength is not enough. , is meaningless, so it can be said that the existing friction stir welding is not suitable for the welding of pipes and plates

Moreover, at present, friction stir welding can only weld the same material or two materials with small hardness differences, such as copper-aluminum, but it cannot weld two materials with large hardness differences such as aluminum-steel

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