Question: Welding of 0Cr25Ni20 stainless steel – what precautions should be taken when welding this type of stainless steel? Welding process? How to avoid cracks?
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This post was last edited by kareale88 on 2019-2-26 at 19:04; the file bg14.jpg was used. Question: Cracks, specifically crackling patterns, appear in the welds formed when 0Cr25Ni20 stainless steel is welded manually. What precautions should be taken when welding this type of stainless steel? Welding process? How to avoid cracks?
As a supplementary note, the new standard numbers and new grades
Austenitic stainless steels have a high thermal expansion coefficient and low thermal conductivity; therefore, a lower heat input should be used during welding. 0Cr25Ni20 is prone to shrinkage deformation, so the weld cross-sectional area should be reduced when designing the groove. To prevent the formation of arc heat cracks, it is necessary to control the C\P\S content of the welding material and keep the area around the groove clean.
What welding method does the poster use?
The 310S material is prone to cracking when the arc is extinguished.
For the poster’s reference, try to keep the S and P content in the welding materials as low as possible.
:The device that L is working on now is made entirely of 310S material, with a wall thickness of 26 mm – and it’s full of cracks! ! :Q
If passed by the school*, if there are many welding cracks, it is likely a problem with the welding process; it is necessary to seek a professional agency to prepare a welding assessment report, and welding should be carried out in strict accordance with the requirements outlined in that report. If cracks still appear, then communicate with the agency that prepared the assessment report to have it revised.
Our company often uses 310s to weld cylinder bodies; this type of manual welding requires a low current and multiple passes. The same problems you mentioned have also occurred when using automatic welding in the past.
Personally, I think the problem lies in whether the right welding rod or wire was chosen, as well as the welding current/voltage and welding speed
Pay attention to controlling the P and S contents, and strictly control the temperature between rows. For more technical information, please follow the official account “Chemical Equipment Innovation Base””