Repair welding of pipeline leaks
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The economizer in coal chemical plants is exposed to temperatures over 600 degrees Celsius; sulfur, hydrogen, and carbon monoxide are the main substances that penetrate it. The material used may also contain chromium. What type of welding rod should be used to repair leaks in the pipes? I tried 507, 317, and 422 rods, but none of them worked – the surfaces did not fuse together. I request an explanation.
This post was last edited by sifangok on 2016-11-2 at 20:18. The J507 welding rod can be used; if repair isn’t possible, it’s best to take more stringent measures—dry the welding rod in an oven before welding； Before welding, it is essential to remove rust and oil stains, and to cut bevels at the areas where repairs will be made ； Preheat the area around the welding site before welding (especially when the temperature is low). In short, use all the methods that can ensure welding quality in order to eliminate any possibility of incomplete welding
The economizer, which can withstand temperatures of over 600 degrees Celsius, is usually made of 15CrMo; for 12Cr1Mov, E-309 stainless steel welding rods are used. Before welding, the area around the weld spot is first heated using a flame to remove elements such as sulfur and hydrogen, followed by riveting at the weld site.