Internal and flange face cladding of neck flange?
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Found out while looking at the equipment drawings: The interior of the 20# forging flange and its flange surface are overlayed with 3mm thick 316L stainless steel. Please tell me how to weld 316 internal flange neck internal surfacing inside the flange? And how to ensure the strength of the flange?
The specific method of cladding depends on the size of the flange and the existing equipment of your company. Some companies have relatively advanced cladding equipment and can realize automatic cladding of flanges.
Nanhua machine can automatically GTAW inner hole surfacing, the minimum inner diameter is 50mm, we have just done it
For example, the specification is DN150 PN2.5 diameter butt welding flange
If the large diameter one can still be operated, the small one will be difficult. Did the poster use a lined flange? Is the 3mm stainless steel lining or the surfacing layer? Are you sure? This layer of stainless steel is mainly to prevent the carbon steel from contacting the medium. It plays an isolation role, and the strength is mainly the carbon steel part. There should be no problem in this regard.
If you want to reduce investment and solve the corrosion problem, haha, it is better to use loose flange, which is simpler and more convenient: lol :lol.
Generally, large-diameter stainless steel composite finished flanges are used on pipelines. The flange neck is about 5mm stainless steel. In other words, it is like a stainless steel pipe lined with carbon steel. Some nozzles on the equipment require surfacing welding. In addition to design factors, cost reasons may be more important.
For diameter butt welding flanges with specifications of DN150 PN2.5, it is completely possible to use the process of surfacing the inside of the flange - processing the groove - and then butt welding to the nozzle (argon arc welding primer). Please see the construction node diagram for details. If it is not in the diagram, contact the design unit. Note: The 3mm thick 316L stainless steel surfacing is for anti-corrosion purposes and has no impact on the strength of the flange.
Is it necessary to use surfacing welding? In many cases in non-ferrous metal equipment, the lining method is used to solve type problems.
Stacking is also very simple, we can stack it, there is a hot wire automatic welding machine
We can also use TIG cladding equipment, which is very simple.
We use surfacing technology, fully automatic welding machine, hot wire Tig welding, and the bonding strength is greater than 400Mpa. Mail: wanda_wangjianlin@163.com