As is known to all, the production and manufacture of high-quality galvanized pipe, not only stainless steel plate is good, but also must be applicable at each stage of the processing technology and other levels. Only in this way can we ensure the production of galvanized pipe is of very high quality. So, what is the harm to the quality of galvanized pipe? Let's find out.
1, electric welding temperature: high carbon steel material, electric welding temperature control in 1250~1460℃, can reach the wall thickness of 3~5mm full welding regulations. The welding temperature is mainly controlled by adjusting the high frequency eddy heat power and welding speed. When the heat is not enough, the heated welding edge can not reach the welding temperature, the metal material mechanism still maintains solid, resulting in unwelded or unwelded; When the heat transfer is too large, the heated welding edge exceeds the welding temperature, resulting in coarse crystals or melting drops, resulting in welding holes.
2, electric welding: galvanized pipe is generally selected high frequency welding machine, high frequency welding is a kind of magnetic induction welding (or working pressure contact welding), it does not need to weld filler, no welding splash, welding thermal hazard area narrow, welding shape beautiful and generous, welding welding physical properties and other advantages, so it is widely used in the manufacturing of seamless steel pipe. According to the magnetic effect of the current and the skin effect, proximity effect and vortex thermoelectric effect of the positive charge in the electric conductor, the material part of the welding edge is heated to the melting state, and the roller extrusion makes the weld complete crystal indirect bonding, so as to achieve the purpose of welding welding, and produce a solid straight seam welding after refrigeration.
3, welding gap: the hot rolled strip is sent into the welding pipe unit, extrusion molding of multi-channel hot rolled strip, hot rolled strip slowly roll, generate annular pipe material with open gap, adjust the pressure of the extrusion roll, so that the welding gap is operated in 1~3mm, and make both sides of the weld flush. If the void is too large, the proximity effect will be reduced, the heat of the vortex is not enough, and the indirectness of the welded crystal will not be welded or crack. If the gap is too small, it will lead to the expansion of proximity effect, welding heat is too large, resulting in welding ablation; Or welding after extrusion, extrusion forming pit, harm welding surface quality.
The above is a key step in the production and manufacture of galvanized pipe to ensure the quality of galvanized pipe. Galvanized pipe and other goods must be purchased to leave a message online.
