It should be known that missed welding usually refers to the process of welding joints that are not welded during welding. Missed welding can easily cause quality accidents. The reasons for welding errors generally include the following. It may be that the current is too high and melts or the current is too small to weld. Just adjust the appropriate current; it may be that the left and right sides of the welding gun are not aligned or the position of the welding gun is too high. The adjustment master can just align the welding gun; it may be that there is no argon gas and the welding flame is not concentrated, just replace the argon gas; it may be that the mold and steel are contaminated with water or oil, causing the welding flame to be uneven, use Tina water It will be no problem to clean the steel belt with turpentine, turpentine or toluene. Of course, there are other factors that cause 316 stainless steel pipes to miss welds.
In addition, preventive measures need to be taken to increase flow quality inspections and increase the frequency of final inspections to prevent missed welding and empty welding, and unqualified products will not be transferred to the next process. Therefore, it is very necessary to use some method to detect soldering leaks.
To detect whether there are leaks in the electric welding of 316 stainless steel pipes, color inspection can be used. Color inspection is a non-destructive testing method. It is a surface inspection method mainly used to detect surface damage such as cracks that cannot be recognized by the naked eye, such as detecting near-surface defects (cracks), pores, porosity and separation of 316 steel pipes, defects such as layers, lack of permeability and Lack of fusion (also called PT test). It is suitable for inspecting dense metal materials (welds), non-metallic materials and defects (cracks, holes, etc.) on the product surface.
The basic principle of colored penetrant flaw detection agents: use colorant to cover the surface of the material, and then the colorant penetrates into the damaged part. After some time, rinse the colorant off the surface. Apply developer to the developed surface. The damaged part of the 316 stainless steel pipe can be clearly seen because the colorant has penetrated into it.
Infrared leakage detection equipment is usually used to detect leakage. Infrared solder leak detection is a non-destructive test that uses a method of measuring infrared radiation of a component to obtain surface temperature or temperature distribution to determine whether there are internal defects in the operating state. If welding is found to be missing, the equipment will issue an alarm message, and the production machine will automatically cut off the 316 stainless steel pipe corresponding to the alarm to prevent the missing pipe from flowing into the next process.
The above is the content of the causes and detection methods of leakage welding of 316 stainless steel pipes. There are many reasons for missing welding, and it is difficult to determine which one, and preventive measures need to be taken. To detect whether pipes are missing welds, you can use colored flaw detectors and infrared leak weld detection equipment. Missing welding will cause certain economic losses and waste. Therefore, welding seam inspection must be carried out on 316 stainless steel pipes to prevent missing welding and incomplete penetration of welded pipes.
