Connection and cutting of 304 stainless steel pipes

First, how to connect 304 stainless steel pipes

The following are 7 ways to connect 304 stainless steel:

1. Pressing type: The pressing type connection of 304 stainless steel pipes is very simple, mainly divided into "single pressing" and "double pressing". Pressing type connection is a stable connection method. The pipe fittings are clamped on the pipes with hydraulic pliers and sealed with O-rings to achieve a tighter connection effect. The pressing type connection is simple to operate, has good sealing, and cannot be disassembled after clamping.

2. Assembly type: The assembly type connection of 304 stainless steel pipes is simpler and more convenient than the pressing type connection. One plug and one twist, and the connection is completed quickly.

3. Welding type: The welding type connection is welded using a hot melt process, and the connection strength is high, but this method is highly dependent on the craftsmanship of the welder, and the quality is difficult to guarantee.

4. Groove type: The groove type connection is to tighten the nut of the pipe fitting so that the expansion convex ring pipe and the stainless steel pipe fitting are axially compressed, and the connection effect is achieved through the water stop of the conical sealing ring. This method is very convenient to install and remove, but the cost of forging clamps is very high.

5. Socket welding: The socket welding connection is to insert the stainless steel pipe into the pipe fittings, and then we connect the stainless steel pipe fittings by argon arc welding so that the 304 stainless steel pipe fittings are self-melted into one. This connection is very reliable and does not require maintenance in the later stage.

6. Threaded: The threaded connection of 304 stainless steel pipe is that the stainless steel pipe fittings and pipes are directly tightened like screws, that is, the inner interface and the outer interface are tightened to each other. This method can achieve freehand installation, which is simple, convenient, and fast to achieve the connection effect.

7. Flange type: The flange connection is to connect two stainless steel pipe fittings with flanges by tightening the bolts. This connection method can be said to be very mature, with relatively high connection and pressure-bearing performance, and can also be disassembled, but the cost is relatively high.

Second, how to cut 304 stainless steel pipes

1. Grinding wheel cutting: It is to cut 304 stainless steel pipes with a high-speed rotating grinding wheel. This is a common and effective stainless steel pipe-cutting method. It can cut 304 stainless steel pipes quickly and accurately, but some burrs will be generated at the end of the stainless steel pipe after cutting. Use a stainless steel pipe burr remover or a correct and effective method to remove burrs to achieve better results. Straight-line cutting may only have a grinding wheel, but this is sufficient for most purposes.

2. Laser cutting: Laser cutting uses a focused high-power density laser beam to irradiate the surface of stainless steel, so that the irradiated material quickly melts, vaporizes, ablates, or reaches the ignition point, and at the same time uses a high-speed airflow coaxial with the beam to blow away the molten material, thereby realizing the cutting of 304 stainless steel pipes. The energy is highly concentrated, the heating is rapid, the cutting speed is fast, the cutting quality is good, and various complex shapes of stainless steel materials can be accurately and effectively cut, and the cost of subsequent process processing is low, but the price of laser cutting equipment is quite expensive, and it is only suitable for large enterprises to use in large-scale production.

3. Wire cutting: Wire cutting is developed based on electric spark perforation and forming processing. It uses a moving metal wire (molybdenum wire, copper wire, or alloy wire) as an electrode wire, and generates high temperature through pulse spark discharge between the electrode wire and the 304 stainless steel tube to melt or vaporize the metal, thereby forming a slit, cutting out parts. This cutting method is burr-free and the incision is smooth, but the stainless steel pipe wire will be slightly discolored after cutting, and subsequent grinding treatment is required. It is complex and inefficient and not suitable for large-scale use.

4. Plasma cutting: The plasma cutting method was invented in the 1950s. It is a processing method that uses the heat of a high-temperature plasma arc to locally melt (and evaporate) the metal at the incision of the workpiece and uses the momentum of high-speed plasma to remove the molten metal to form an incision. This method is fast, but there will be some metal residues on the inner wall of the 304 stainless steel tube after cutting, which needs to be cleaned and plasma cut. The stainless steel pipe mouth will have some discoloration, the incision is not smooth, and it is easy to form cutting quality problems.