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.
 

Solutions:

 
- 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.

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