Plugging leaks under pressure for high-pressure steam weld toe cracks
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For steam pipelines at 9.8 MPa and 540°C, the diameter of the elbow fittings is 32 mm, and the length of the weld root crack is 20 mm. The leak sealing is completed after twisting and seaming, using a leak-sealing fixture, welding, and injecting glue.
I’ve learned it; may I ask what \"twisted sewing\" means? How do I operate it?
It is using steam pipes at 9.8 Mpa and 540℃. Seam twisting involves using a pneumatic seam twisting machine (with high-frequency vibration) to first anchor the crack, and then carrying out clamping welding and glue injection
These past few days, another leak was sealed at the weld toe under conditions of 9.8 Mpa and 540℃
There is no standard manufacturing process; the reason for cracking in this area needs to be identified before further preventive measures can be taken. It could be due to stress issues or welding heat treatment problems. I’m not sure what material it is made of – could it be from the Cr or Mo series?
Material: 12Cr1MoV