To ensure the long-term safe operation of heat-resistant steel welded joints under high temperature, high pressure, and various corrosive media conditions, the performance of pressure vessel automatic welding joints should meet the following requirements.

①接头的等强性 耐热钢接头不仅应具有与母材基本相等的室温和高温短时强度，而且更重要的是应具有与母材相近的高温持久强度。

① The high-strength heat-resistant steel joint of the joint should not only have room temperature and high-temperature short-term strength that is basically equal to the base material, but more importantly, it should have high-temperature endurance strength similar to the base material.

②接头的抗氢性和抗氧化性 耐热钢接头应具有与母材基本相同的抗氢性和高温抗氧化性。为此，焊缝金属的合金成分和含量应与母材基本一致。

② The hydrogen resistance and oxidation resistance of the joint. The heat-resistant steel joint should have basically the same hydrogen resistance and high-temperature oxidation resistance as the base material. Therefore, the alloy composition and content of the weld metal should be basically consistent with the base metal.

③接头的组织稳定性 耐热钢焊接接头在制造过程中，特别是厚壁接头将经受长时间多次热处理，在运行过程中将长期受高温高压的作用，接头各区不应产生明显的组织变化及由此引起的脆变或软化。

③ The structural stability of heat-resistant steel welded joints, especially thick walled joints, will undergo multiple heat treatments for a long time during the manufacturing process. During operation, they will be subjected to high temperature and pressure for a long time. There should be no obvious structural changes or resulting embrittlement or softening in each area of the joint.

④接头的抗脆断性 虽然耐热钢压力容器大多数是在高温下工作，但当压力容器和管道制造完工后将在常温下进行设计压力1.25倍压力的水压试验。在安装检修完后，要经历水压试验及冷启动过程。因此，耐热钢焊接接头亦应具有一定的抗脆断性。

④ Although most heat-resistant steel pressure vessels work at high temperatures, the resistance to brittle fracture of joints will undergo a water pressure test at 1.25 times the design pressure at room temperature after the completion of pressure vessel and pipeline manufacturing. After installation and maintenance, it is necessary to undergo a hydraulic test and a cold start process. Therefore, heat-resistant steel welded joints should also have a certain degree of resistance to brittle fracture.

⑤接头的物理均一性 耐热钢焊接接头应具有与母材基本相同的物理性能。焊缝金属的热膨胀系数和热导率应基本一致，这样就可避免接头在高温运行过程中的热应力。

⑤ The physical homogeneity of the joint is that the welded joint of heat-resistant steel should have basically the same physical properties as the base material. The thermal expansion coefficient and thermal conductivity of the weld metal should be basically consistent, so as to avoid thermal stress in the joint during high-temperature operation.