Chemical liquid transport vehicles are generally used for the transport of highly corrosive substances. Therefore, their production requirements are relatively high. Because of the relatively high requirements for quality and safety assurance factors, chemical liquid transport vehicles are generally more sophisticated in their workmanship, and even in the welding of these small details, there are particularly high requirements. Next, let Xiao Bian explain to you what the chemical liquid transport vehicles should pay attention to when welding what?
1, for the more common 18-8 type austenitic stainless steel transporter, in the welding process generally requires the use of short-arc fast small-line energy welding, in order to minimize the weld overheating, to prevent excessive welding due to excessive columnar Crystal structure, thereby reducing the welding residual stress, to prevent corrosion cracking and thermal cracking of welded joints should be done. Because the welding superheat is reduced, the time for the weld metal to stay in the sensitizing temperature zone is correspondingly reduced, so the intergranular corrosion tendency of the welded joint is also reduced.
2. For ferritic stainless steel chemical liquid transport vehicles, the grains in the heat-affected zone during welding will grow up, leading to a sharp drop in plasticity and toughness of joints, brittleness, and easy formation of cold cracks under the effect of welding residual stress. When welding austenitic stainless steel chemical vehicles, if the welding process is improper or the welding materials are not properly selected, a series of defects such as intergranular corrosion, welding hot cracks, and brittleness of welded joints are easily generated, which directly affects the performance of the welded joints and the welding seams. quality.
3, manual tungsten argon arc welding stainless steel chemical vehicles, are generally used ordinary DC argon arc welding machine, but if the conditions allow it is best to use pulse argon arc welding machine.
4. Due to the low thermal conductivity of austenitic stainless steel chemical vehicles, a greater penetration depth than structural steel can be obtained at the same welding current. In order to obtain a certain size weld, and at the same time to prevent overheating, the welding current should be lower than that of welding. The alloy steel is 10%-20% smaller, and the use of fine diameter welding wire should not only achieve the desired penetration depth, but also make the section of the bead relatively relatively small. The relative reduction of the welding current is beneficial to improve the welding seam resistance. Cracking performance.
Chemical liquid transport vehicles belong to the category of high-dangerous goods transport vehicles. If welding is not enough attention, it will easily leave adverse consequences. Therefore, in order to guarantee the quality of chemical liquid transport vehicles, we must strictly do the appropriate work.
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