无论是在一般的汽车、船舶、锅炉制造中,还是在尖端的原子能装置、火箭、飞机生产中都有导管的焊接。随着这些工业的不断发展,对导管提出了越来越高的要求。尤其是在尖端产品中,不仅要求导管能耐高温,耐高压,耐疲劳,耐振动等,而且导管直径和壁厚也趋向减小。因此,导管材料逐渐选用不锈钢,耐热钢, Whether in the general car, ship, boiler manufacturing, or cutting-edge atomic energy devices, rockets, aircraft production has a catheter welding. With the continuous development of these industries, the catheters are set higher and higher requirements. Especially in the cutting-edge products, not only requires high temperature catheter, high pressure, fatigue resistance, vibration resistance, etc., and the catheter diameter and wall thickness also tend to decrease. Therefore, the catheter material is gradually selected stainless steel, heat-resistant steel,