Stainless steel welding problem?
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The stainless steel material is 1Cr25Ni20Si2, and A402 welding rods were used during welding. All the welds cracked. Could you please tell me what's going on? What brand of welding rod should be used?
Try using A402, 407
1Cr25Ni20Si2, judging from the grade, the strength of this material is relatively high, and the high Si content will affect the welding performance. It is best to look at the recommended welding process for this material. Are there any requirements for preheating before welding and insulation after welding? In addition, it is best to have welding done by welders who have experience in welding similar materials. Welding without knowing the welding performance of the material can easily lead to problems.
Use of A402 welding rod 1. A402 must be dried at 250~300 degrees for 1 hour before use. 2. Due to the high Cr-Ni content of the deposited metal, which is all austenitic structure and prone to high temperature cracks, low current and single-action rod movement should be used for welding. 3. When welding, ensure that the interlayer temperature is below 150 degrees. 3.2 The current of the welding rod is 80~100A, but I recommend using A422 and A427 welding rods, the effect will be much better
This material has relatively high C and Si contents, making it difficult to weld. You can use some high-nickel welding materials, 25/35 or 35/45 materials. There seems to be no national standard for these materials. If you think these materials are difficult to find, you can just use nickel-based ones, just use NiCrFe-3.