Welding edge technology for thin metal

Welding edge technology for thin metal

Date 06/05/2019

In welding techniques, metal welding in the folding position is not too difficult, but to ensure that the arc burns evenly, it is necessary to note the following:

Joint edge thin sheet


The order of performing bonding thin sheet joints at the 1G position:


Processing step

Step read drawing

Technical requirements of thin-walled solder:

- Ensure the right size.

- No deformation.

- Solder joint is not deformed.

1. Select welding material: Welding material is black steel sheet.

- Processing (embryos are cut to 150x50x2mm, for 2 plates).

- For details with a thickness of d = 2, we bend the edge of the plate according to the parameters as shown.

Welding workmanship must meet the following technical requirements:

- The edges bend and stick.

- embossed surfaces.

- Small bending corner.

2. Adjust the welding and welding parameters.

Plate length (mm)  No. of welding layers   Welding gap (mm)   Wire diameter (mm) Ih (A)   Uh(A)  Vh(mm)  Gas consumption (I/ph)
 2  0-1 0.8  70-120  18-21  18-25  8-10 
- Select welding parameters:
- Welding:
Put the workpiece on the desk, making sure the gap between the two parts is even.

The embankment angle of the reverse deformation is g = 30-50

Technical requirements of the welded joints:
- Welded full angle, sure.
- Link at the gap open.

- Make sure that the bonding edge is on.


3. Conduct welding:


- The embryo is fixed on the desk, 1G welding position.
- Adjust the welding parameters correctly.
- Welding: Place the grinding torch at the specified welding position. Proceed with right-to-left welding as shown below. The welding operation keeps the welding torch at a constant distance. Hold the groove in a straight line. At the end of welding, perform a dotted stop to fill the welding groove.

Other common types of welding defects and remedies:


1. The soldering joint is punctured

There are many reasons for punctured welding such as too large welding currents, poor solder joint preparation, too wide gap or too slow welding speed.


- Reduced welding current and welding voltage.
- Check the weld bead, ensure tightness, uniformly tight.
- Speed ​​up welding to reduce the risk of burns.

2. Welded joints are deflected.


Welded paths can be misaligned due to such reasons as: Angle of grit groove is incorrect, the position of the grip is uneven, or the operation of the welders are inaccurate.

Measures to limit the phenomenon of offset  axis welding:

- In soldering, try to maintain the angle of the torch properly.

- The weld bead should be checked before adjustment.

In short, when welders fold the edges for thin metal, you need to ensure the following:

- Choose the appropriate parameters.
- Select the welding mode, air flow to match the thickness of the welding material.
- Welded embryos are firmly fixed, welded  the right size.
- Corrugated welds must be sufficiently porous, scales folded, not porous and slag, not deformed.
- After welding, it is necessary to check the weld quality.
- Repair any weld defects, if any.

- In the process of welding,welders  must ensure the hygiene and safety of the workshop.