1.1铬钼抗热钢的焊接性
铬和钼是主要的合金元素，珠光体耐热钢可显着改善金属的高温强度和高温氧化的耐药性，但它们使金属焊接性能，焊接接缝和热影响区域具有很高的趋势，在焊接后，焊接且易于产生易于产生的空气和易于构成的易于产生的机构，不仅会影响到易于的且易于效果，因此，焊接的机构又会构成且易于构成的，且易于构成焊接的机构。压力，因此冷裂纹趋势.
因此，耐热钢焊接的主要问题是裂纹，裂纹的形成是三个要素：焊接中的结构，应力和氢含量，因此开发合理的焊接过程.尤其重要
2.1凹槽
Groove processing is usually done by flame or plasma cutting process. When necessary, cutting should also be preheated, and PT inspection should be done after polishing to remove the cracks on the groove. Usually choose v-type groove, groove Angle is 60℃, from the point of view of preventing crack, groove Angle is more favorable, but increase the welding amount, and the凹槽和地面两侧的内部清洁，去除油，生锈和水以及其他污垢（氢，防止孔隙率）.
2.2设置
Request cannot enforce group to prevent to produce internal stress, because of its high chromium molybdenum alloy steel crack tendency, therefore, when the welding seam of the constraint℃not too large, WeChat public number: king of welding, so as not to cause excessive stiffness, especially in thick plate welding, prevent weld free shrinkage of brace, jig and fixture, should avoid to use.
2.3选择焊接方法
At present, the commonly used welding methods for pipeline welding in petroleum and petrochemical installation units are GTAW for the bottom and electrode arc welding for the cover. Other welding methods include MIG welding, CO2 gas welding, electroslag welding and automatic submerged arc welding, etc.
2.4焊接材料的选择
选择焊接材料的原理，焊接金属的合金成分和强度性能应与碱金属的相应指数一致，或者应达到产品.的技术条件提出的最低性能指数，并且为了使氢的氢含量应与碱性低的氢型或弗内克斯（Electerate n and It wit IT）与Drivesion n and ITS相关的氢含量应与氢含量相同。 micro welder, put them in electrode increases with the increasing use in heat insulation barrels, electrode to no more than 4 hours in the heat insulation barrels, otherwise should resume drying, drying times shall not be more than three times, in the process of concrete construction, have detailed provisions. Austenitic stainless steel electrode, such as A307, can also be used for manual arc welding of铬酸铬热钢，但在焊接.之前仍需要预热，此方法适合于在焊接后不能热处理焊接部件的情况.}
2.5预热
预热是在焊接珍珠耐热钢.中进行冷裂纹和压力消除的重要技术措施，以确保焊接质量，预热和维持一定温度范围，应在点固定和焊接过程中进行{2}}}}}}}}}}}}}}}}}
2.6焊接后冷却缓慢
在焊接后缓慢冷却之后，必须严格遵循焊接铬钼热钢的原理，即使在炎热的夏天也必须这样做，通常在焊接焊缝焊接焊缝和接缝区附近的石棉布焊接后立即进行，将小焊接放入石棉瓶中，慢速冷却{0}}..... {0}..................
2.7焊接后热处理
焊接后应立即进行热处理，以防止延迟破裂，消除压力并改善微观结构.
