What should we pay attention to in the welding process of Teflon hose?

From the point of view of welding process, we should also pay attention to the following matters:

First, clean the surface of aluminum alloy before welding, and all dust and oil pollution must be removed. You can use to clean the surface of aluminum alloy welds. For thick aluminum alloy, clean it with wire brush first, and then clean it again.

Second, the welding wire material used should be as close as possible to the parent metal, and whether to choose aluminum-silicon welding wire or aluminum-magnesium welding wire should be decided according to the requirements of welding seam.

In addition, Al-Mg welding wire can only be used to weld Al-Mg materials, while Al-Si welding wire is relatively widely used, which can weld both Al-Si materials and Al-Mg materials.

Third, when the thickness of the plate is relatively large, preheat the plate in advance, otherwise, it is prone to weld imperviousness, and when closing the arc, close the arc with a small current to fill the pit.

Fourthly, when tungsten argon arc welding is carried out, a DC argon arc welding machine should be used, and forward and reverse alternating current and direct current should be used alternately. Forward direct current is used to clean the oxide mold on the aluminum surface, and reverse direct current is used for welding.

In addition, pay attention to setting welding specifications according to plate thickness and weld requirements. For MIG welding, special aluminum wire feeding wheel and Teflon wire guide tube should be used, otherwise, aluminium scrap will occur. The length of welding gun cable should not be too long, because the aluminum welding wire is soft, and too long welding gun cable will affect the wire feeding stability.