Welding issues in high-pressure pipelines
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Is beveling still required for welding high-pressure pipes with a diameter of 10 mm or less?
I think a large gap should be created, so submerged arc welding would be appropriate
I think grooves need to be made; otherwise, it won’t be easy to weld through.
It is necessary. This is also a requirement for welding high-pressure pipelines.
Grooving is required, with a single-side angle of not less than 30 degrees
Regarding whether a groove needs to be made, it is recommended that: 1. First, check the relevant provisions in the design documents; if such provisions exist, they should be followed； 2. Secondly, it shall be carried out in accordance with the relevant provisions of GB50235-97 \"Code for Construction and Acceptance of Industrial Metal Piping Projects\". For reference!
I checked GB50235-97, the Code for Construction and Acceptance of Industrial Metal Piping Projects; it only provides specifications on how to prepare grooves, but lacks guidelines regarding whether grooves are necessary for small-diameter high-pressure pipes.
It is related to the pipe wall thickness; the thickness limits for pipes without bevels can be found in the relevant standards.
The main factor to consider is the wall thickness; if it is too thick, it’s difficult to weld through, so bevels need to be created.
Grooves should be made; otherwise, it will affect the strength of the weld. TIG welding is the best method to use
No beveling is required. Although it is a high-pressure pipeline, its diameter is too small, so the wall thickness won’t be very thick (this can be calculated). The root margin required for beveling is 2 mm; therefore, no beveling is needed, and the weld can be completed directly either by manual welding or TIG welding.