What is the process for cladding STL with 12CrMov?

2016-10-27View Original

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What is the process for cladding STL with 12CrMov?

Reply #22016-10-28

1. Anneal the base material to relieve stress. 2. Machine it, and conduct PT testing to ensure no cracks are present. 3. Requirements for the filler metal in the transition layer: 1) Ultra-low carbon, low hydrogen filler metal； 2) Nickel-based welding materials, or ER309; the former is recommended ； 3) And dry it. 4 Preheat the base material and maintain an interpass temperature of 250~300 degrees during welding. 5 Weld the transition layer. 6 Cool slowly immediately after welding, and carry out post-weld heat treatment (PWHT) at 600 degrees to relieve stress. 7 Machine the part, and perform PT testing to ensure no cracks are present. 8 Preheat the base material and maintain an interpass temperature of 250~300 degrees during welding ； 9 Clad with STL, and PT inspection showed no cracks. 10 Slow cooling immediately after welding, followed by post-weld heat treatment PWHT at 600 degrees to relieve stress; PT inspection showed no cracks. 11 Machined, and PT inspection showed no cracks

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