Professional welding preparation: The key to reliable and reproducible welding results

A professional welding preparation is the first step towards reliable and reproducible welding results without welding defects such as porosity or binding defects. The basis for this is gap-free positioning, i.e. the centered and ring-shaped fixing of the tubes on the area to be welded tube position.

benefits the pipe fixation

Pipe fixing is an advantageous welding preparation for every tube position: flush, recessed and protruding. When fixing a pipe, the tube is extended exactly at the point where the weld seam is later placed. The gap between the tube and the hole in the tube sheet is closed, but still allows ideal degassing during the welding process.

fixing vs. stapling: A comparison

• fixing:

• The tube is positioned centrally in the hole.

• Ideal degassing during the entire 360° welding cycle.

• Mechanical expansion of the pipe without the use of additional material.

• No welding experience required.

• Stapling:

• The tube is pulled to the stitching point, which causes a larger gap on the opposite side.

• Dirt is pushed in front of the arc and contaminates the weld seam in the last quarter.

• tube and tube sheet are hardened by heat input.

• Additional material and/or melting of the pipe at the tacking point.

• Professional welder required.

Summary

Only pipe fixing enables high-quality weld seams without pores and defects. By following these steps, the likelihood of welding defects can be significantly reduced, resulting in long-lasting, high-quality weld seams.