In domestic manufacturing of cold drawn steel tube when adopted two kinds of welding methods. In Russia's special machinery manufacturing, manufactured a series of titanium alloy to stainless steel and cold drawn steel tube, there are two kinds of manufacturing method of cold drawn steel tube. Since this year, the country has repeatedly punch for cold drawn steel tube industry consolidation, for pollution emission, low profits of small steel mills, survival is difficult, especially in since march, small HanGuanChang under the strict implementation of the policy, have to make production maintenance, but for large steel mills, while domestic steel prices continue to fall, most HanGuanChang has turn into losses, but the losses have not hit HanGuanChang shutdown maintenance condition, and in iron ore, coke has been more of a big drop in prices of raw materials, such as cases, steel mills as the supplement low raw material to reduce the production cost, is still in the high production to consumption, and the price is raw material inventory as far as possible, in addition, nearly 20 since the start of the new production of blast furnace, the middle of march to late April production of blast furnace has five, the release of the new capacity is also the important reason for the increase in capacity.

The first is to use silver based solder brazing in vacuum or protective gas, the second is vacuum diffusion welding.

Different diameter 08 x18h10t stainless steel pipe and cold drawn steel tube structure is shown in figure 1, special turn over structure as shown in figure 2. Cold drawn steel tube before the diffusion welding assembly and installation is according to the structural characteristics of the pipe diameter size and carried out respectively. And start the high-frequency heating to welding temperature, and then heat preservation 10 to 20 minutes, and through the lifting mechanism and so on pressure, can complete the welding process. Before the diffusion welding assembly sequence and welding process with small diameter welding pipe diffusion welding are the same. Why demand is so light, has a trend of higher yield, the personage inside course of study thinks, multiple suppression, such as small businesses by environmental protection and the big companies have taken advantage of the city.

Liaocheng Jin Baocheng steel pipe co., LTD., located in the beautiful scenery of the "ancient China liaocheng jiangbei shuicheng canal" is a production, trade, shipping is a body comprehensive enterprise. I plant the existing punching machine two, Taiwan 2 30 finishing mill, two 50 finishing mill, drawbench 3. Specializing in the production of perforated tube billet MAO, hot-rolled steel pipe, cold drawn steel tube, precision seamless tube. Specifications 10-159 mm annual production capacity of 55000 tons. Regular billet: 10 # 20 # 45 # 20 cr Q345B 40 cr 20 crmo 35 crmo 42 crmo 20 crmnti 27 simn for special alloy pipe. Perennial large number of production of Q345B, 20 cr, 40 cr, 35 crmo, 42 crmo, 20 crmnti, Gcr15 steel tubes, etc.