In the process of 20Cr welded steel pipe welding, after appearance inspection and X-ray nondestructive testing, 20Cr welded steel pipe surface cracks appear in the appearance, and there are defects such as pores in the weld. In order to ensure the quality of the 20Cr welded steel pipe.
1. controlling 20Cr welded steel pipe welding process parameters strictly, reducing cooling speed, improving weld forming coefficient properly, adopting multi-layer multi-pass welding with small current short arc no swing or small swing.
2. reasonable selection of welding process parameters and line energy, such as pre-welding and post-welding heat treatment, reasonable control of 20Cr welded steel pipe welding interlayer temperature. The drying temperature is 350℃ and the drying time is 1.5 hours.
3. cleaning the 20Cr welded steel pipe surface of the base metal for 20 mm before welding, such as water, oil, oxide, rust, etc.
4. reducing the 20Cr welded steel pipe welding speed. Easy to overflow internal gas, reasonable adjustment of welding process parameters.
Katalor is a well professional steel exporter in China, so we can supply the 20Cr welded steel pipe with high quality and different sizes. If you have any questions about 20Cr welded steel pipe, please contact us freely. We will reply you as soon as possible with 20Cr welded steel pipe detail information and price.
