How to weld 1Cr5Mo and 1Cr9Mo

Reference can be made to SH3085-1997 \"Technical Requirements for Welding Carbon Steel and Chrome-Molybdenum Steel Tubes in Petrochemical Tubular Furnaces\" and SH/T3526-2004 \"Welding Procedures for Dissimilar Steels in Petrochemical Applications\"

It’s a pity that all the SH3085 standards available online are garbled characters

The garbled text is due to the font; it works fine with Fox Reader

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Use R507 welding rod, with preheating before welding and heat treatment after welding

Additional information to the above: Refer to 1Cr9Mo – R507 is used as the welding rod, while the wire grade is H1Cr5Mo. After groove preparation, a visual inspection should be carried out; the surface must be free of defects such as cracks, delamination, or inclusions. (When the design documents require non-destructive testing of the groove surface, it shall be carried out in accordance with JB4730, with the testing area extending 20 mm inward from the end of the groove.) ) The pre-welding heating temperature should be 250–350°C, with the preheating area extending at least 100 mm on each side of the center line of the joint. The area within 100 mm outside the heating zone should be insulated. When welding the joint, once the preheating temperature is reached, the base layer should be welded immediately, and the welding should be completed in one continuous pass. After welding the joint that requires post-weld heat treatment, such treatment should be carried out immediately; otherwise, measures such as post-heating or slow cooling should be taken. The heat treatment temperature is 750–780°C. After heat treatment, surface Brinell hardness should be sampled and tested for the weld seam, the heat-affected zone, and the surrounding base material; the number of samples taken should be no less than 10% of the total number of heat-treated welds. The hardness value should be HB≤241. The heating area should be defined as a region centered on the weld seam, with each side extending to a distance of less than three times the width of the weld seam but not less than 25 mm. A 100-mm area outside this heating zone must be kept at a constant temperature.