welding process of pulse hot press working principle

Working principle and process of hot stamping machine

Working principle of pulse hot press:

A 2000W transformer is used to generate a large current with low voltage, which is heated rapidly through the welding joint. Pulse current refers to the ratio of ON and OFF frequencies of the current. The larger the pulse ratio is, the larger the current output is, and the faster the welding joint is heated.

Working process of pulse hot press:

Place the workpiece in a fixture (vacuum can be activated to secure it if necessary). Send the fixture to the welding joint, press the double start button, the workpiece is pressed under the welding joint (start heating), the temperature rises rapidly according to the input parameters and the accurate constant temperature, up to 4 temperature zones (at this time, the soldering tin backflow), the blowing cooling (soldering tin solidification), the welding joint rises (finished).

Welding process of pulse hot press

Hot press welding machine welding is the use of various fusible alloys (solder) to join the metal parts of the process. The melting point of the solder is lower than that of the welded material, so that the part can be welded through the contact between molecules on its surface without being melted.

Hot pressure welding machine welding can be divided into soft welding and hard welding, soft welding temperature is lower than 450℃, hard welding is higher than 450℃. Hard welding is generally used for silver, gold, steel, copper and other metals, its welding point is much stronger than soft welding, shear strength is soft welding 20-30 times. The term welding is commonly used for both of these thermal connections, as in both cases the molten solder is written into a thin gap in the solid metal surface of the two equipment to be cleaned and close together.

The hot - press welding machine guarantees the metal continuity. On the one hand, two kinds of metals are connected with each other by bolt or physical attachment, which is a strong metal, but this connection is not connected, and sometimes the appearance of the metal if there is oxide insulation film, they even right or wrong physical touch. Another disadvantage of mechanical connection to welding is that the contact surface continues to oxidize, resulting in an increase in resistance. Other, shaking and other mechanical shocks can also loosen joints. Welding is to eliminate these problems, the welding site does not attack relative movement, the contact surface will not oxidize, the conductive method of connection can be maintained. Welding is the fusion process between two metals, solder in the melting state, will dissolve some of the metal touched with it, and the appearance of the metal is often welded with a thin layer of solder can not dissolve the oxide film, flux is used to remove this layer of oxide film. The welding process generally includes:

1, flux melting, and then to remove the welding metal surface of the oxide film;

2, melt the solder suspended in the meantime of the impurity material and light flux to float to the surface;

3, some to dissolve some metal and solder connection;

4, cooling and complete the melting of metal and solder.

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