The type of resistance welding and the applicable occasions

15 Jun 2019

Resistance welding is a welding method in which a current is passed through a resistance heat generated between a workpiece and a welding contact surface to heat the weldment to a plastic or partially melted state, and then pressure is applied to form a welded joint. Resistance welding is divided into three types: spot welding, seam welding and butt welding. (1) Spot welding: the weldment is pressed between the two columnar electrodes, and is heated by electricity to melt the weldment at the contact to form a nugget, then power off, and solidify and crystallize under pressure to form a dense joint. . Spot welding is suitable for welding thin plates (laps) and steel bars up to 4 mm, and is widely used in the production of automobiles, airplanes, electronics, instruments and daily necessities. (2) Seam welding: Seam welding is similar to spot welding except that a rotating disk electrode is used instead of the column electrode. The stacked workpieces are energized between the discs and f...

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What are the characteristics of electrode arc welding

10 Jun 2019

What are the characteristics of the composition of low carbon steel welded joints and the microstructure and properties of metals in various regions during electrode arc welding? (1) The welded joint consists of weld metal and heat affected zone. 1) Weld metal: When welding, the temperature at the weld is above the liquidus, and the base metal and the filler metal form a common molten pool, which becomes an as-cast structure after condensation. During the cooling process, the liquid metal crystallizes from the fusion zone toward the center of the weld to form a columnar crystal structure. Since the electrode core and the coating have alloying effect during the welding process, the chemical composition of the weld metal is often superior to that of the base metal. As long as the electrode and welding process parameters are selected reasonably, the strength of the weld metal is generally not lower than the strength of the base metal. 2) Heat-affected zone: The area where the metal on bot...

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Classification and advantages of arc welding

31 May 2019

A fusion welding method using an electric arc as a heat source is called arc welding. Can be divided into manual arc welding, submerged arc automatic welding and gas shielded welding. The biggest advantage of manual automatic welding is that the equipment is simple, flexible and convenient to apply, wide in application, and can weld various welding positions and straight seams, ring seams and various curve welds. Especially suitable for welding in the case of constant operation and welding of short welds; Submerged arc automatic welding has the characteristics of high productivity, good weld quality and good working conditions; Gas shielded welding has the characteristics of good protection effect, stable arc and concentrated heat.

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What is brazing

25 May 2019

What is brazing? How is brazing classified? What are the characteristics of the brazed joint form? Brazing is to use a metal whose melting point is lower than that of the base material as a brazing material. After heating, the brazing material melts, the weldment does not melt, the base material is wetted by the liquid brazing material, the joint gap is filled and the base material is mutually diffused, and the weldment is firmly fixed. Connected together. Brazing is divided into soldering and brazing depending on the melting point of the solder. (1) Soldering: The soldered solder has a melting point of less than 450 ° C and a low joint strength (less than 70 MPa). (2) Brazing: The brazing filler metal has a melting point higher than 450 ° C and a higher joint strength (greater than 200 MPa). The bearing capacity of the brazed joint is related to the size of the joint face. Therefore, brazing is generally lap joints and kits to compensate for the lack of brazing strength.

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ZHE JIANG CHENG HONG MACHINERY CO.,LTD

21 May 2019

Zhejiang Chenghong Machinery Co.,ltd Is a professional manufacturer engaged in PE, hdpeP, PPT thermoplastic plastic pipe engineering machinery, with advanced technology, practical functions, products certified by CE, is currently one of the largest docking welding machine manufacturers in Zhejiang. Specializing in the production of supply automatic docking hot melt welding machine, semi-automatic docking buttfusion welding machine (hydraulic semi-automatic and manual), large diameter plastic pipe socket welding machine, PPR socket welding machine. The products are sold well all over the country more than 30 provinces, autonomous regions, and exported to the Middle East, eastern Europe, southeast Asia, central Asia and other African countries.      

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2019 New products Catalogue

17 May 2019

Butt fusion welding machine (Manual &Hydraulic) 40-160mm,63-200mm.63-250mm, 90-315mm,90-355mm,200-400mm, 200-450mm,250-500mm,315-630mm, 450-800mm,63-1000mm,710-1200mm, 1200-1600mm

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