What should be paid attention to during the welding process of stainless steel structural parts?
Publish Time: 2025-02-24
During the welding process of stainless steel structural parts, due to the material characteristics and size limitations, special attention should be paid to a series of welding matters to ensure the welding quality and the performance of the structural parts. The following are the key points to pay attention to when welding stainless steel structural parts.First, it is very important to choose the right welding rod. Stainless steel welding rods can be divided into two categories: chromium stainless steel welding rods and chromium-nickel stainless steel welding rods. When choosing, the material, thickness and welding requirements of the stainless steel should be considered comprehensively. Chromium stainless steel welding rods have excellent corrosion resistance and heat resistance, but poor weldability, and attention should be paid to process control and heat treatment conditions. Chromium-nickel stainless steel welding rods are widely used due to their corrosion resistance and oxidation resistance. When welding, the welding current needs to be controlled, which is about 20% less than that of carbon steel welding rods, and narrow welding technology should be used to ensure welding quality.Secondly, the preparation work before welding is also critical. The rust, oil and other impurities in the welding part must be thoroughly cleaned to prevent the formation of pores. The shielding gas should be argon with a purity of 99.99% to ensure that the welding effect has no color difference. At the same time, the appropriate welding arc length is also the key. The welding arc length of stainless steel is generally 13mm.During the welding process, a power supply with vertical external characteristics should be preferred, and positive polarity should be used under DC conditions, that is, the welding wire is connected to the negative electrode. This setting helps to achieve a stable welding effect and is particularly suitable for welding thin plates below 6mm. In addition, the distance from the nozzle to the workpiece should generally not exceed 15mm, and the length of the tungsten electrode protruding from the gas nozzle should be optimized to 4-5mm, which can be appropriately adjusted in areas with poor shielding.The environment also has a significant impact on the welding of stainless steel structural parts. When welding in a windy environment, a screen must be taken to prevent the influence of wind; when welding indoors, appropriate ventilation measures should be taken to ensure that the welding process is not disturbed by the external environment.Finally, post-welding treatment is equally important. The weld should be checked for defects such as undercuts, weld nodules, and pits, which will reduce the bearing capacity of the structural parts and even cause cracks. For defects exceeding the standard, they must be thoroughly removed and welded.In summary, during the welding process of stainless steel structural parts, attention should be paid to electrode selection, welding preparation, welding parameter setting, environmental control and post-welding treatment to ensure the welding quality and the performance of the structural parts.
