国内在制造无缝异型钢管时采用了两种焊接方法。在俄罗斯的特种机器制造业中，采用了一系列钛合金来制造不锈钢与无缝异型钢管，制造无缝异型钢管的方法有两种。今年以来，国家已经多次对无缝异型钢管行业进行重拳整顿，对于排污大、利润低的小钢企来说，生存格外艰难，尤其在3月份以来，小焊管厂在政策的严厉执行下，不得不进行减产检修，然对大钢企来说，尽管国内钢价持续下降，多数焊管厂已经转入亏损，但亏损幅度仍未触及焊管厂停产检修条件，且在铁矿石，焦炭等原材料价格也出现较大幅度下降的情况下，钢企为补充低价原料来降低生产成本，仍在维持高生产来尽量消耗高价原料库存，另外，年初以来新增投产高炉近20座，其中3月中旬至4月末投产高炉便有五座，新增产能的释放也是产能增长的重要原因。
There are two welding methods used to manufacture cold drawn steel pipes in China. In Russia's special machine manufacturing industry, a series of titanium alloys are used to make stainless steel and cold-drawn steel pipes, and there are two methods to make cold-drawn steel pipes. Since this year, the state has repeatedly rectified the cold-drawn steel pipe industry. It is especially difficult for small steel enterprises with large discharge and low profit to survive. Especially since March, small welded pipe mills have had to reduce production and overhaul under the strict implementation of the policy. However, for large steel enterprises, although the domestic steel price continues to fall. Most of the welded pipe mills have already turned into losses, but the losses have not touched the conditions for the shutdown and maintenance of the welded pipe mills, and in the case of iron ore, coke and other raw materials prices have also dropped considerably, steel enterprises are still maintaining high production to consume high-priced raw materials stocks as much as possible in order to reduce production costs by replenishing low-priced raw materials. Nearly 20 new blast furnaces have been put into operation since the beginning of the year. Five of them were put into operation from mid-March to the end of April. The release of new capacity is also an important reason for the increase of production capacity.
第一种是采用银基钎料进行的真空或保护气体中的钎焊，第二种是真空扩散焊接。不同直径08X18H10T不锈钢管和无缝异型钢管的结构如图1所示，特种转接管的结构如图2所示。无缝异型钢管扩散焊前的装配和安装是根据其管径尺寸和结构特点分别进行的。并启动高频加热至焊接温度，然后再保温10~20分钟，并通过升降机构等施以压力，即可完成焊接过程。扩散焊前的装配安装顺序及焊接操作流程与小口径焊管扩散焊接相同。为何需求如此清淡之时，产量却还是呈走高之势，业内人士认为：小企业受到环保等多重打压，而大企业则趁机抢市。
The first is the vacuum or shielding gas brazing using silver-based solder, the second is vacuum diffusion welding. The structures of 08X18H10T stainless steel pipes with different diameters and cold-drawn pipes are shown in Figure 1, and the structures of special transfer pipes are shown in Figure 2. The assembly and installation of cold drawn steel pipes before diffusion welding are carried out respectively according to their pipe diameter and structural characteristics. And start high-frequency heating to the welding temperature, and then heat preservation for 10-20 minutes, and through the lifting mechanism to apply pressure, you can complete the welding process. The assembly and installation sequence and welding procedure before diffusion welding are the same as the diffusion welding of small diameter welded pipe. Why is the demand so light, but the output is still on the rise, industry insiders believe that: small businesses by environmental protection and other multiple suppression, while large enterprises seize the opportunity to market.
