rotary table machine welding sequence determines whether your welding molding looks good? What is the welding sequence? The so-called welding sequence is that in the welding structure, which part is welded first and which part is welded later, or which weld is welded first and which weld is welded later, that is, the welding sequence of each weld.

What is the effect of improper welding sequence selection on welding quality?

Improper selection of welding sequence has the following effects on welding quality:

(1) The welding sequence directly affects the stress and deformation of the weldment, if the improper selection will cause excessive deformation or internal stress of the weldment, which not only reduces the quality of the weldment, but also leads to the scrapping of the weldment.

(2) Improper selection of assembly and welding sequence often causes welding difficulties in some positions, and even completely unable to weld. Seriously reduce the strength of the welded structure, or air tightness requirements.

(3) If the welding sequence of stainless steel welding structure is improperly selected, the working weld in contact with the corrosive medium will be subjected to the thermal action of the post-welding weld after welding and produce intergranular corrosion, reducing the corrosion resistance of the welds.

How to choose the welding sequence in general?

The basic principles for selecting the welding sequence are as follows:

(1) From the perspective of assembly welding: the welding sequence should be considered in accordance with the principle of not causing welding difficulties and not welding welds.

(2) From the perspective of reducing welding deformation and residual stress:

1) Welding outward from the center of the welding structure;

2) Welding from thick plate direction to thin plate direction;

3) First weld joints with large shrinkage (butt joints), and then weld joints with small shrinkage (lap joints, Angle joints);

4) Weld vertical weld first, and then weld flat weld;

5) Parallel welds should be welded in the same direction as far as possible;

6) Weld staggered short welds first, and then weld straight long welds.

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