Tacking pipe connections before the soldering process in series production
This workshop deals with tack welding in series production. In particular, it deals with the tack welding of stainless steel pipe sections before the brazing process.
Material preparation
First of all – as always – it is important to clean the pipe sections to be connected. Normal brake cleaner or acetone is suitable for this to remove dirt or oil residue.
Setting the welding parameters:
Both pipes have a wall thickness of 0.4 mm and are to be tack-welded at the neck with two spot welds. Both pipes are made of stainless steel, which is why the stainless steel setting (display symbol “V2A” on the left) is used. As there is an angle or fillet weld as a joint between the neck on the pipe and the inserted pipe, the corresponding welding geometry “fillet weld” (display symbol on the middle right) was used as the setting.
Welding
When welding the pipes with 0.4 mm wall thickness, a 1.0 mm electrode was used and the pipes were tack welded with one spot weld on the front and one on the back. A power of 30–35 % with a pulse duration of between 5.0 ms was selected.
Next steps in production: Solder paste is applied to the tack-welded pipe sections before they pass through the soldering oven and are brazed.
Tacking a piece of pipe with an end piece before the soldering process in series production
This pipe has a wall thickness of 0.5 mm and is to be tack-welded to a solid stainless steel pipe holder. Here too, the workpieces must be degreased and cleaned before welding. Note: There is a gap in the sample parts. In general, however, the components should ideally be free of gaps in order to achieve the best possible welding results
Welding
In this case, the bracket (wall thickness 4 mm) was also tack-welded to the tube (wall thickness 0.5 mm) using two opposing welding points. A pulse duration of 6.0 ms with a power of 40–45 % was selected.
