双金属复合管是近年来开发的一种新材料，它的内层是不锈钢管，外层嵌套碳钢管或低合金钢管，采用旋压复合工艺使两者紧密贴合，使其既拥有不锈钢优良的耐腐蚀性，又保证管道能够承受较高的工作温度和工作压力，还能有效地节约建造成本。双金属复合管特别适合对输送管道有较高要求的介质，如凝析油本身含有大量腐蚀介质，且工作温度和工作压力较高，若选用不锈钢管道输送，建造、维护成本很高，而选用双金属不锈钢管道在满足相同的腐蚀条件下，建造、维护成本则能够降低较多。双金属复合管在今后的石油石化生产中将成为不可或缺的材料，因此掌握双金属复合管的焊接方法和焊接工艺，将为我公司在今后更好的占领石油石化领域提供技术支持。
Double metal composite pipe is a new material developed in recent years, the inner layer is a stainless steel tube, the outer layer of carbon steel or low alloy steel pipe is nested, the spinning composite technology makes them tightly, which not only has the excellent corrosion resistance of stainless steel, and ensure the pipeline can withstand high working temperature and pressure. Can effectively save the construction cost. Double metal composite pipe is especially suitable for the higher requirements of the medium on the pipeline, such as condensate contains large quantities of corrosive medium, and high working temperature and pressure, if the selection of stainless steel pipeline, construction, and maintenance costs are high, and the selection of double metal corrosion of stainless steel pipe to meet the same conditions, the construction and maintenance cost it can reduce more. The bimetal composite pipe will become an indispensable material in the future petroleum and petrochemical production. Therefore, mastering the welding method and welding process of the bimetal composite pipe will provide technical support for our company to better occupy the petroleum and petrochemical field in the future.