316 stainless steel pipe leakage welding causes and detection methods

316 stainless steel pipe is commonly used in petroleum, chemical, food and other industrial transportation pipeline, which has high requirements for the weld quality of the pipe, such as allowing leakage welding phenomenon. And when welding, if the staff is not skilled in welding technology, or if the welding is not checked in time after welding, there may be leakage welding.

To know the leakage of welding usually refers to the existence of welding not welded weld process, leakage of welding is easy to cause quality accidents. Welding errors are generally due to these reasons, may be too high current melted or current is too small to weld, just adjust the appropriate current; may be the torch left or right is not aligned or the torch position is too high, adjust the machine master will be the torch aligned on the good; may be no argon, weld fire is not centralized, replace the argon on it; may be the molds and steel bands with water or oil, resulting in weld fire is not concentrated, with the use of water, turpentine or toluene to clean the steel bands will be no problem. The water, turpentine or toluene to clean the steel belt will be no problem. Of course, there are other factors causing 316 stainless steel pipe leakage welding.

In addition, it is also necessary to take preventive measures to increase the flow quality inspection and increase the frequency of the final inspection to prevent the occurrence of leakage welding and empty welding, unqualified not to hand over to the next process. Therefore, it is very necessary to use some kind of method to detect leakage welding.

To detect whether the 316 stainless steel pipe welding leakage welding, you can use coloring flaw detection, color inspection is a non-destructive testing method. It is a surface inspection method that is mainly used to detect surface damage such as cracks that cannot be recognized by the naked eye, such as detecting near-surface defects (cracks), porosity, porosity, and separation, defects, such as layers, lack of penetration and lack of fusion of 316 steel pipe (also known as PT inspection). It is suitable for inspecting dense metallic materials (welds), non-metallic materials and defects (cracks, porosity, etc.) on the product surface.

The basic principle of color penetrant flaw detector: the surface of the material is covered with a coloring agent and then the coloring agent penetrates into the damaged part. After a period of time, the colorant is rinsed off the surface. A developer is applied to the developed surface. Since the colorant penetrates into it, the damaged part of the 316 stainless steel pipe can be clearly seen.

Infrared leakage welding detection equipment is usually used to detect whether there is a leakage of welding. Infrared leakage weld detection is a non-destructive test, which uses the method of measuring the infrared radiation of the component to obtain the surface temperature or temperature distribution to determine whether there are internal defects in the operating state technology. If a weld leakage is found, the equipment will issue an alarm message, and the production machine will automatically cut off the 316 stainless steel pipe corresponding to the alarm, in order to prevent the missed pipe from flowing into the next process.

The above is the 316 stainless steel pipe leakage welding causes and detection methods. There are many reasons for leakage welding, it is difficult to determine which one, but also need to take preventive measures. To detect whether the pipe leakage welding, you can use coloring flaw detection agent, infrared leakage welding detection equipment. Leakage welding will cause certain economic losses and waste, so in 316 stainless steel pipe must be weld detection, in order to prevent the welded pipe from leakage welding, not welded through and other phenomena.