In order to ensure the long-term safe operation of heat-resistant steel welded joints under high temperature, high pressure and various corrosive media, the performance of welded joints of automatic pressure vessel welding machine shall meet the following requirements.

1.接頭的等強(qiáng)性 耐熱鋼接頭不僅應(yīng)具有與母材基本相等的室溫和高溫短時(shí)強(qiáng)度，而且更重要的是應(yīng)具有與母材相近的高溫持久強(qiáng)度。

1. The equal strength heat-resistant steel joint of the joint shall not only have the short-time strength at room temperature and high temperature basically equal to the base metal, but also, more importantly, have the high-temperature endurance strength similar to the base metal.

2.接頭的抗氫性和抗氧化性 耐熱鋼接頭應(yīng)具有與母材基本相同的抗氫性和高溫抗氧化性。為此，焊縫金屬的合金成分和含量應(yīng)與母材基本一致。

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

3.接頭的組織穩(wěn)定性 耐熱鋼焊接接頭在制造過(guò)程中，特別是厚壁接頭將經(jīng)受長(zhǎng)時(shí)間多次熱處理，在運(yùn)行過(guò)程中將長(zhǎng)期受高溫高壓的作用，接頭各區(qū)不應(yīng)產(chǎn)生明顯的組織變化及由此引起的脆變或軟化。

3. Structural stability of the joint. During the manufacturing process, especially the thick wall joint, the welded joint of heat-resistant steel will undergo multiple heat treatments for a long time. During the operation process, it will be affected by high temperature and high pressure for a long time. There shall be no obvious structural change and embrittlement or softening in each area of the joint.

4.接頭的抗脆斷性 雖然耐熱鋼壓力容器大多數(shù)是在高溫下工作，但當(dāng)壓力容器和管道制造完工后將在常溫下進(jìn)行設(shè)計(jì)壓力1.25倍壓力的水壓試驗(yàn)。在安裝檢修完后，要經(jīng)歷水壓試驗(yàn)及冷啟動(dòng)過(guò)程。因此，耐熱鋼焊接接頭亦應(yīng)具有一定的抗脆斷性。

4. Brittle fracture resistance of the joint although most of the heat-resistant steel pressure vessels work at high temperature, the hydrostatic test of 1.25 times the design pressure will be carried out at room temperature after the manufacturing of the pressure vessel and pipeline is completed. After installation and maintenance, it shall go through the process of hydrostatic test and cold start. Therefore, the welded joint of heat-resistant steel should also have certain brittle fracture resistance.

5.接頭的物理均一性 耐熱鋼焊接接頭應(yīng)具有與母材基本相同的物理性能。焊縫金屬的熱膨脹系數(shù)和熱導(dǎo)率應(yīng)基本一致，這樣就可避免接頭在高溫運(yùn)行過(guò)程中的熱應(yīng)力。

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

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