國內(nèi)在制造無縫異型鋼管時采用了兩種焊接方法。在俄羅斯的特種機器制造業(yè)中，采用了一系列鈦合金來制造不銹鋼與無縫異型鋼管，制造無縫異型鋼管的方法有兩種。今年以來，國家已經(jīng)多次對無縫異型鋼管行業(yè)進行重拳整頓，對于排污大、利潤低的小鋼企來說，生存格外艱難，尤其在3月份以來，小焊管廠在政策的嚴厲執(zhí)行下，不得不進行減產(chǎn)檢修，然對大鋼企來說，盡管國內(nèi)鋼價持續(xù)下降，多數(shù)焊管廠已經(jīng)轉(zhuǎn)入虧損，但虧損幅度仍未觸及焊管廠停產(chǎn)檢修條件，且在鐵礦石，焦炭等原材料價格也出現(xiàn)較大幅度下降的情況下，鋼企為補充低價原料來降低生產(chǎn)成本，仍在維持高生產(chǎn)來盡量消耗高價原料庫存，另外，年初以來新增投產(chǎn)高爐近20座，其中3月中旬至4月末投產(chǎn)高爐便有五座，新增產(chǎn)能的釋放也是產(chǎn)能增長的重要原因。

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.

第一種是采用銀基釬料進行的真空或保護氣體中的釬焊，第二種是真空擴散焊接。不同直徑08X18H10T不銹鋼管和無縫異型鋼管的結(jié)構(gòu)如圖1所示，特種轉(zhuǎn)接管的結(jié)構(gòu)如圖2所示。無縫異型鋼管擴散焊前的裝配和安裝是根據(jù)其管徑尺寸和結(jié)構(gòu)特點分別進行的。并啟動高頻加熱至焊接溫度，然后再保溫10~20分鐘，并通過升降機構(gòu)等施以壓力，即可完成焊接過程。擴散焊前的裝配安裝順序及焊接操作流程與小口徑焊管擴散焊接相同。為何需求如此清淡之時，產(chǎn)量卻還是呈走高之勢，業(yè)內(nèi)人士認為：小企業(yè)受到環(huán)保等多重打壓，而大企業(yè)則趁機搶市。

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.