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Features of high frequency welded pipe machine
Release time:
2022-11-11 09:27
high frequency welded pipe machineIs through the development of welding speed, welding heat affected zone is small, welding without cleaning as well as the workpiece, can improve the welding of thin-walled pipe and metal pipe.
The production technology of high-frequency pipe welding machine mainly depends on the diversity of products. A series of processes from raw materials to finished products are required. In order to complete these processes, various mechanical equipment and welding, electrical control and inspection devices are required. These equipment and devices are reasonably arranged according to different process requirements. The typical process of high-frequency welded pipe is: longitudinal shearing-uncoiling-strip leveling-head and tail shearing-strip butt welding-looper storage-forming-welding-deburring-fixed length-flaw detection-flying shear-initial inspection-steel pipe straightening-pipe section processing-hydraulic test-crack detection-printing coating-finished product.
When the high frequency welding machine determines the oscillator, inductance and impedance, the efficiency of the oscillation tank, output transformer and inductance will be determined. The change in input power is approximately proportional to the change in input heat. If the input heat is insufficient, the heating edge cannot reach the welding temperature, and the solid structure is maintained without welding, forming welding cracks; if the input heat is large, the heating edge is easy to overheat when the welding temperature is exceeded, even if it is overheated, cracks will appear after stress; When the input heat is too large, the welding temperature is too high, which will cause the weld to crack and cause molten metal to splash to form holes. The welding temperature is generally 1350~1400 ℃.
The welding pressure of the high-frequency pipe welding machine is one of the main parameters in the welding process. After the two sides of the pipe are heated to the welding temperature, ordinary metal grains are formed under the action of the extrusion force, that is, mutual crystallization welding. The welding pressure affects the strength and toughness of the weld. If the applied welding pressure is small, the welding edge of the metal cannot be completely compressed, the non-metallic inclusions and metal oxides remaining in the weld are not easy to be discharged due to the low pressure, the weld strength decreases, and the weld is easy to crack after being stressed; when the pressure is too high, most of the metal reaching the welding temperature is squeezed, which not only reduces the welding strength, but also produces defects such as excessive internal and external burrs or lap welding. Therefore, in practical application, reasonable welding pressure should be obtained according to different varieties and specifications. According to practical experience, the unit welding pressure is generally 20 ~ 40mpa.
Due to the possible tolerances of the tube blank width and thickness, as well as the increase of the welding working temperature and the fluctuation of the welding development speed, there may be no changes related to the different welding extrusion forces. The amount of welding extrusion can usually be controlled by continuously adjusting the distance between the enterprise squeezing rollers or controlling the difference in circumference between the front and rear tubes of the squeezing roller.
High frequency welded pipe machine
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