Selection of welding equipment and methods for thin-walled stainless steel pipes

The medium transported by thin-walled stainless steel pipes is mostly products or production raw materials. If during the installation process of the pipeline, there are defects such as burrs, pits, and excessive weld seams in the welds inside the pipes, it will easily cause the transported products or raw materials to accumulate in the pipes and cause rot, which will ultimately affect the quality of the products being moved.

Therefore, the weld forming requirements for this type of pipe are very high. The requirements are double-sided forming, undercutting and incomplete welding are prohibited. The weld height is less than 1mm, and the pit depth is not greater than 0.3mm. In particular, the weld inside the pipe must be formed. Uniform, smooth and without burrs, the weld height is uniform and less than or equal to 0.3mm. In view of this situation, the welding of thin-walled stainless steel pipes in this project requires superb welding technology to ensure the quality requirements of the project installation.

The first is the selection of welding equipment. Because the stainless steel pipe wall is 1mm-2mm thin, the welding melt is shallow, the weld requires double-sided forming, and the pipe mouth is not oxidized. You can choose a DC tungsten arc welding machine. The welding machine model is AT-180. This equipment has the following characteristics and can fully meet the requirements for welding of thin-walled stainless steel pipes.

The first feature is that the tungsten electrode is not easy to overheat due to its small calorific value. A tungsten electrode of the same size and diameter can use a larger current, the workpiece generates a large amount of heat, and the productivity is high. Moreover, because the tungsten electrode is a cathode, it has strong thermal electron emission and a stable arc. And concentrated.

The second feature is that argon gas effectively isolates the surrounding air and the tungsten electrode does not react. The arc in tungsten electrode argon arc welding also has the function of automatically removing oxidation from the surface of the workpiece.

The third feature is that the tungsten arc is stable, that is, it can still burn stably under a very small welding current-especially suitable for welding of thin-walled pipes.

The fourth feature is that the heat source and filling wire can be controlled separately, so the heat input is easy to adjust. It can be welded in various positions and is also an ideal method to achieve single-sided welding and double-sided forming.

The fifth feature is that since the filler wire does not pass through the arc, there will be no spatter and the weld will be beautifully formed.

The second step is to choose the appropriate welding method. The choice of method should be determined based on the material and quality requirements of the workpiece to be welded. Since it is mainly welding thin-walled and small-diameter stainless steel pipes, the weld must be ball-shaped on both sides, smooth and burr-free. In this case, according to the performance and advantages of the tungsten argon arc welding machine (AT-18O), you can choose to fill the pipe with Argon gas manual tungsten arc welding. The reason is that argon is an inert gas, and the alloy elements of the metal to be welded and the welding wire are not easily burned during welding. The weld is beautiful, smooth, burr-free, and of good quality. It also reduces the process of slag cleaning and acid purification. It is fast and efficient, and can fully meet the requirements of construction period and project quality.