Reveal the importance of positioning welding, what are the positioning and role?

Release time:

2022-08-09

【Summary Description】 During the welding process, it is very important to ensure that the position of the weldment is fixed and to avoid misalignment or movement by tack welding. However, because it is usually not used as a formal weld, the subsequent removal or melting into the formal weld, welding quality is often not taken seriously. We will take you to understand the relevant knowledge of positioning welding and reveal the importance of positioning welding. Q1 What is tack welding? Tack welding refers to welding for assembling and fixing the position of weldment joints. The English name is Tack Weld. The definition of tack welding in AWS A3.0 is as follows: "A weld made to hold the parts of a weldment in proper alignment until the final welds are made." Q2 Tack welding function · Fixed weldment position, control welding deformation; · Keep the root clearance of weldment; · Replace the fixture, convenient welding; Easy to remove, easy to group again. Q3 Tack welding requirements In the offshore industry, different project requirements will be slightly different, the general requirements are as follows: · Qualified WPS, qualified welder; · Preheat in accordance with the applicable WPS; The weld length is 100mm or 4 times the plate thickness; · Sufficient thickness to avoid cracking. Q4 Common Tack Welding Problems If there are defects in the welding quality of tack welding, it will often have a serious impact on the subsequent formal welds, so the welding quality of tack welding also needs everyone's attention. According to current project statistics, common tack welding problems are as follows: · Groove cleaning, preheating and welding are not performed according to WPS; Insufficient tack length or thickness; There are defects such as slag inclusion, undercut and cracks.

During the welding process, it is very important to ensure that the position of the weldment is fixed and to avoid misalignment or movement by tack welding. However, because it is usually not used as a formal weld, the subsequent removal or melting into the formal weld, welding quality is often not taken seriously. We will take you to understand the relevant knowledge of positioning welding and reveal the importance of positioning welding.

What is tack welding?

Tack welding refers to welding for assembling and fixing the position of weldment joints. The English name is Tack Weld. The definition of tack welding in AWS A3.0 is as follows: "A weld made to hold the parts of a weldment in proper alignment until the final welds are made."

Tack welding function

· Fixed weldment position, control welding deformation;

· Keep the root clearance of weldment;

· Replace the fixture, convenient welding;

Easy to remove, easy to group again.

Tack welding requirements

In the offshore industry, different project requirements will be slightly different, the general requirements are as follows:

· Qualified WPS, qualified welder;

· Preheat in accordance with the applicable WPS;

The weld length is 100mm or 4 times the plate thickness;

· Sufficient thickness to avoid cracking.

Common Tack Welding Problems

If there are defects in the welding quality of tack welding, it will often have a serious impact on the subsequent formal welds, so the welding quality of tack welding also needs everyone's attention. According to current project statistics, common tack welding problems are as follows:

· Groove cleaning, preheating and welding are not performed according to WPS;

Insufficient tack length or thickness;

There are defects such as slag inclusion, undercut and cracks.

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Reveal the importance of positioning welding, what are the positioning and role?

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