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What Should Be Paid Attention To When Welding Flanges And Pipes?

What Should Be Paid Attention To When Welding Flanges And Pipes?

  1. The flange contact surface should be smooth, annular shallow groove can be allowed, but there shall be no spot scar, sand hole and radiation to the groove, the two flange surface evenly and strictly contact.
  2. The center line of the flange plane shall be perpendicular to the center line of the pipe, and the deviation shall not be greater than 1-2.5mm.
  3. Flange screw hole distance position (linear measurement) allowable error 0.5-1.0mm.
  4. The allowable displacement error between flange hole center line and pipe center line is 1-2mm.
  5. The allowable deviation of the two flanges is 0.2-0.3mm.
  6. When welding flange and pipe, attention should be paid to welding stress deformation (especially stainless steel). To ensure the verticality of the flange and the pipeline, avoid two flanges in bolt connection flange parallelism deviation is too large, resulting in gasket clamping and leakage.
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Automatic Welding of Corrugated Metal Hose

Automatic Welding of Corrugated Metal Hose

Corrugated metal hose (bellows Corrugated pipe) is an important flexible pipe in modern industrial pipeline. In various gas transmission and infusion pipeline systems and length, temperature, position and angle compensation systems, as compensation elements, sealing elements, connecting elements and damping elements, they are widely used in aerospace, petrochemical industry, mining electronics, machinery and shipbuilding, medical and health, light textile electronics, energy construction and other fields.

Corrugated metal hose is mainly composed of corrugated pipe, mesh sleeve and joint, as shown in Figure 1. The inner pipe is a thin-walled stainless steel bellows with spiral or annular waveform. The mesh sleeve of the outer layer of the bellows is woven by stainless steel wire or steel strip according to certain parameters. The joints at both ends of the hose are either flanges or screw heads, with various forms, which vary according to the application conditions.
1. The welding process of corrugated metal hose generally includes two processes:

(1) Welding of mesh sleeve, corrugated pipe and compression sleeve – metal hose body;

(2) Welding of metal hose body and pipe joint.

Automatic corrugated metal hose welding machine

The metal hose body is a three-layer structure, namely mesh sleeve, corrugated pipe and compression sleeve, The assembly quality and welding process before welding are strict, and the precision of automatic welding machine is high.

The equipment has the function of automatic tracking of longitudinal and transverse welds. It can track the non roundness of compression sleeve and the height runout of mesh sleeve and bellows end face in real time, so as to ensure the stability of welding process and welding process. The practical application shows that the equipment has high degree of automation, accurate positioning of welding gun, flexible process adjustment, high repeatability and stable welding quality

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Automatic Metal Hose Joints (Flange) Welding Machine

Automatic Metal Hose Joints (Flange) Welding Machine

Automatic welding machine for metal hose joints, welding gun and displacement mechanism can realize flexible angle adjustment, so that the equipment has wide adaptability and can complete the welding of most existing pipe joints such as flanges, elbows and wire heads.

Key points of welding process

1 Key points of metal hose body welding process

(1) Due to the special three-layer structure of the metal hose body and the poor repeatability of pre welding assembly, the welding process must have enough tolerance window.

(2) Because thin-walled parts are very sensitive to welding line energy, the welding process requires accurate control of welding current and welding voltage, and must be matched with the amount of wire filling.

2.key points of metal hose joint welding process

Generally specking, the thickness of hose joint and compression pipe sleeve is quite different, and the types of pipe joint are diverse. Therefore, the influence of welding angle on weld formation and quality should be fully considered in the welding process.

Conclusion

  • Corrugated metal hose has a wide range of applications and large dosage. Its working temperature range can reach – 196 ℃ ~ + 420 ℃, and the pressure range is generally pN0 6-32.0mpa, up to 42.0mpa, with high weld quality requirements.
  •  Due to the special multi-layer structure of metal hose, in order to ensure the welding quality, higher requirements are put forward for the butt joint quality before welding, welding process and welding equipment.
  • Automaticwelding process are developed for corrugated metal hose welding industry, with high degree of automation, stable process parameter control, strong process adaptability and good practical application effect
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Operation and adjustment of the Ring forming machine

Operation And Adjustment Of The Ring Forming Machine

Adjustment and use of looping machine: when the machine is powered on and can operate normally, we need to adjust the machine to make it work better for us.

  1. First, according to the operation process of the electric control box, send the wire to the cutter. Adjust the position of the forming wheel and cutter to make the arc of the product meet the requirements. At the same time, adjust the cutter so that the axis of the cutter passes the center of the product.
  2. The flatness of the product can be adjusted by adjusting the position of the forming wheel (in and out of the vertical plane).
  3. If the outgoing line of the product runs inward and outward from time to time, the wire adjusting wheel on the wire adjusting board needs to be adjusted to increase the straightening of the wire. (Most of the above situations are caused by poor wire workpiece. Just increase the straightening force of wire workpiece).
  4. If the equipment needs to be reversed when it is running, the speed regulating switch should be reset first, and the machine can be started after shutdown for 1 minute;
  5. When feeding the dynamic pressure wheel, loosen the fastening bolts first, and fix the bolts on both sides of the driven wheel after the feeding reaches the scale; 6. In the process of use, the miscellaneous stains in the pressure roller groove and the surface of the workbench shall be cleaned in time.