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Jiangsu Gabriel Alloy Technology Co.,Ltd

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Stainless Steel Pipe Welding Method Daquan

Stainless steel pipe heat treatment abroad generally with a protective gas without oxidation of continuous heat treatment furnace, the production process of the middle heat treatment and the final product heat treatment, due to the availability of non-oxidized bright surface, thus eliminating the traditional pickling process. The use of this heat treatment process, both to improve the quality of steel, but also to overcome the acidity of the pollution of the environment.

According to the current trend of world development, bright continuous furnace is basically divided into three types:

(1) roller-type bright heat treatment furnace. This type of furnace for large size, high-volume steel pipe heat treatment, hourly output of 1.0 tons or more. The protective gases that can be used are high purity hydrogen, decomposed ammonia and other protective gases. Can be equipped with a convection cooling system to cool the pipe more quickly.

(2) mesh belt bright heat treatment furnace. This type of furnace is suitable for small diameter thin-walled precision steel pipe, the hourly output is about 0.3-1.0 tons, the length of steel pipe can be up to 40 meters, can also handle the volume of the capillary.

(3) Maverian bright heat treatment furnace. The steel pipe is mounted on a continuous frame and is heated in the muffle, which can handle high-quality, small-diameter thin-walled steel at a lower cost. The hourly output is about 0.3 tons.

Welding of stainless steel welded pipe

1. TIG welding

Stainless steel welded pipe requirements penetration penetration, without oxide inclusions, heat affected zone as small as possible, tungsten inert gas protection of the TIG welding has good adaptability, high welding quality, good penetration performance, its products in the chemical , Nuclear industry and food and other industries are widely used.

Welding speed is not high is the shortcomings of argon arc welding, in order to improve the welding speed, foreign research and development of a variety of methods. Which by the single-electrode single torch development using multi-electrode multi-torch welding method in the production of applications. 70 years Germany first use multi-torch along the weld direction of the straight line, the formation of long-shaped heat flow distribution, significantly improve the welding speed. The general use of three-electrode welding torch welding, welded steel pipe wall thickness S ≥ 2mm, welding speed than the single torch to improve 3-4 times the welding quality can be improved. TIG welding and plasma welding can be welded to a larger wall thickness of the steel pipe, in addition, 5-10% hydrogen in argon, and then use high-frequency pulse welding power supply, but also improve the welding speed. Multi-torch welding is suitable for the welding of austenitic and ferritic stainless steel tubes.

High frequency welding

High-frequency welding for carbon steel pipe production has been 40 years of history, but for welding stainless steel pipe is a relatively new technology. Its production economy, so that its products more widely used in architectural decoration, household appliances and mechanical structure.

High-frequency welding with more power, for different materials, the outer diameter of the steel pipe can achieve a higher welding speed. Compared with the argon arc welding, it is the highest welding speed of more than 10 times. Therefore, the production of general-purpose stainless steel pipe has a high productivity.

Because high-frequency welding speed, to the pipe to remove the burrs to bring difficulties. At present, high-frequency welding stainless steel tube is not acceptable for the chemical industry, the nuclear industry, which is one of the reasons.

From the welding material, high-frequency welding can be welded all kinds of austenitic stainless steel tube. At the same time, the development of new steel and the progress of forming welding methods, but also successfully welded ferritic stainless steel AISI409 and other steel.

3. Combined welding technology

Stainless steel welded pipe welding methods have their own advantages and disadvantages. How to avoid weaknesses, several welding methods to be combined to form a new welding process to meet people on the quality of stainless steel pipe and production efficiency requirements, is the current trend of stainless steel pipe technology development.

After several years of exploration and research, combined welding process has made progress, Japan, France and other countries of the stainless steel pipe production has mastered a certain combination of welding technology.

Combined welding methods are: argon arc welding plus plasma welding, high frequency welding plus plasma welding, high frequency preheating plus three torch welding, high frequency preheating plus plasma argon welding. Combined welding to improve the welding speed is very significant. For the use of high-frequency preheating combined welding steel pipe weld quality and conventional argon arc welding, plasma welding equivalent, welding operation is simple, the entire welding system easy to achieve automation, this combination is easy with the existing high-frequency welding equipment convergence, investment Low cost, good efficiency.