Pipe connection problem

Welding is divided into brazing and fusion welding. I don’t know which category you belong to. Please tell me clearly.

This post was last edited by lp3484 on 2022-7-5 08:21 Socket welding and butt welding, I am talking about steel pipes

First of all, pe is the flat mouth, and be is the bevel. Then, the branch table is the connection method between the main pipe and the branch pipe. It is a tee, open welding (with or without reinforcement), and pipe clamps. The selection rules for main-branch pipe connecting pipe fittings. For the specific pipe fittings used to connect, see the single-line diagram. Reducing tees are generally butt welded in accordance with GB /T-12459, there is also socket welding. According to GB/T-14383, butt welding requires beveling, with a boundary of three millimeters. Bevels cannot be made below three millimeters, and bevels can be made above three millimeters. There are tees of 50X25, but butt welding, otherwise use pipe hoops (single socket pipe hoops)； Reducers are butt welded pipe fittings. Moreover, when the DN25 pipeline does not meet the bevel conditions, double-socket pipe hoops are generally used to reduce the diameter of the 50-25 pipeline, instead of increasing the wall thickness of the small pipe or forcing a connection. The specific method of connection depends on the drawings and branch pipe connection tables issued by the design institute.

Please tell me who these are? Isn’t it generally arc welding or argon arc welding with secondary protection? In what areas are these two types used? Do they have any characteristics?

I work in a design institute. In the past, small projects were drawn by hand and I didn't pay attention to these details. Now, if I want to do three-dimensional piping, I need to define the rules, otherwise the computer won't know how to do it. Like you said, DN50

First of all, instead of smoothing the bevel on site, the bevel is generally made on site. Second, how did you make the material grade list? What was the 50-25 connection method you used in the material table before this, and how was it done in the database? Is it 32X3 butt welding? Or is it about thin wall thickness? The 25mm pipe is PE and BE. This is determined by you or your material professional. Does it mean that 50mm pipe cannot be used with PE or 25mm pipe cannot be used with BE? ? There are two directions. It depends on your project situation and how you choose. Both methods have been told to you. You can decide which one is suitable according to your situation. Also, don’t you pay attention to these when you draw 2D in CAD? Is there any difference between two and three dimensions? During on-site construction, the two-dimensional drawings and the three-dimensional drawings are not the same construction method?

You should be stuck in changing the material grade table now. First of all, there is no problem with the 50 flat mouth. When making the warehouse, make a flat mouth and a bevel for the 50 pipe. When using the 50 Please refer to the grade table for reference. If you don’t understand it, please ask a master. No one will teach you to just re-lubricate the place. The specification of 32X3 is absolutely fine. If you have this wall thickness, you can also use a reducer. It depends on your project. There is nothing to say or anything profound. There are so many pipe fittings and so many connection forms. There is always a suitable one. Don’t take it for granted that 50 and above must be beveled. Think about why, 100 pipes have threaded connections.

These are all fusion welding. It seems that I don’t need to answer your question. I didn't understand the problem before, but I thought it was related to the brazing of the instrument's copper pipe connections. Thanks for your question, I also borrow the optics * :lol

Steel pipe socket welding,,,, feels not as good as the butt joint strength,,,,, I really haven’t seen it, let’s take a look at the explanations from the experts.

For tees, 50* 25 can be socket welded. Some industries also use butt welding entirely. At present, there is no pipe fitting with one end butt welded and one section inserted welded. If you want to have in-depth exchanges on relevant pipeline technology issues, you can join Sichuan Friends.