At present, most hydraulic tubes and hydraulic components are commonly welded with carbon steel and stainless steel materials, which are not only of large weight and poor corrosion resistance. In the pursuit of lightweight today, aluminum alloy materials have many advantages. Most manufacturers use 6061-T6 aluminum alloy seamless tubes instead of carbon steel and stainless steel materials to verify the welding process. It was found that 6061-T6 aluminum alloys have weld inclusions, welding pores, thermal cracks, deformation and softening, and our Division Engineers analyzed the reasons. It was found that the slope did not clean up in time and that some slag was cleaned in time; The choice of protecting gas flow is also very important. It requires high-purity, suitable flow protection gas, and colleagues ensure that the pipeline is dry; Welding preheating has also become particularly important, and cooling speeds need to be controlled. The above is some of our brief talk about welding.