Can metal pipe long-radius elbows be directly welded to necked butt-weld flanges?
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Can metal pipe long-radius elbows be directly welded to necked butt-weld flanges?
Yes, if the ports of the long-radius elbow meet the dimensions standards for welded joints, they can be directly welded to necked welded flanges. .
When the temperature changes, there is a significant difference between the inner and outer circles of the elbow, resulting in large variations in expansion amounts. If flanges are welded directly, it is very easy for stress to accumulate at the weld site of the elbow, leading to crack formation in the weld – especially when working with media such as steam that experience large temperature changes. Therefore, it is generally not recommended to install it in this way.
Both elbows and flanges are types of pipe fittings. There is generally no major issue with directly welding these fittings together; the key factor is the bending radius of the elbow, to ensure that it allows for the proper installation of the flange bolts. If the bending radius does not interfere with the bolt installation, then welding can be carried out directly