There are many kinds of cold welding machines. How to choose a suitable cold welding machine, cold welding machine procurement guide

preface:

At present, there are many kinds of cold welding machine market in China, including electric spark surfacing repair machine, precision repair welding machine, mold repair machine, etc. the above equipment is called cold welding machine. What is the focus of these cold welding machines? What are the advantages and disadvantages? Below, Shanghai Ruiju Electromechanical Equipment Co., Ltd. will give you a detailed answer for your reference when purchasing:

1. Precision repair welding machine: large capacitance energy storage pulse welding machine is adopted. It is also called imitation laser welding machine and super laser welding machine. High energy laser welding machine, sheet welding machine, mold repair machine, precision cold welding machine, stainless steel cold welding machine, etc.

2. Tool and die repair machine: capacitor energy storage pulse resistance welding is adopted. Also known as patch machine, mold doctor.

3. Electric spark surfacing repair machine: it uses large pulse current ionization welding materials, also known as electric spark repair machine, casting defect repair machine, electric spark cold welding machine, metal cold welding machine, etc.

Let's analyze the principle and application scope of these three cold welding machines in turn:

1. Precision repair welding machine, typical model: jh-2000 precision repair welding machine.

Principle: the electric energy stored in the high-capacity capacitor is released between the tungsten electrode and the workpiece in the form of pulse arc in an instant (unit: milliseconds), so that the arc with extremely high temperature can instantly melt and weld the welding wire and the substrate to realize welding.

Analysis of cold welding machine: the energy released by the pulse is large and the time is very short. The energy released exceeds the heat dissipation speed of the workpiece, so the workpiece and welding wire can be fused and welded together in an instant. The heating time is very short (10-20ms), and the heat dissipation time is much longer than the heating time (about 0.2-1s). Therefore, the total heat borne by the workpiece is very small and can be maintained at room temperature.

The main advantages of precision repair welding machine are:

(1) The welded substrate is not limited. The machine can instantly fuse and weld various workpieces and welding wires together.

(2) Silver, copper, aluminum and other non-ferrous metals with very good thermal conductivity can be repaired by welding.

(3) The power loss during operation is relatively small, and the power consumption of about 1kW can reach the welding current of about 500A.

2. Tool and mold repair machine, representative model: jh-y2 tool and mold repair machine.

Principle: the electric energy stored in the high-capacity capacitor is released to the welding spot of the workpiece and filler material in an instant (millisecond unit), and the instantaneous high current makes them heat rapidly and fuse together through the contact resistance to achieve the purpose of repair. This model is suitable for steel and other metal workpieces with high resistivity, but it has poor effect on copper, aluminum and other metal materials with good conductivity.

Cold welding analysis: the heating time is very short (millisecond level), the heating range is very small, and the heating energy of welding is less than that of workpiece, which is also a good cold welding model.

The main advantages of tool and die repair machine are:

(1) Suitable for business trip and after-sales use. Without argon, it can be used by plug-in, and the operation is simple.

(2) The heating is very small, the accuracy is very high, and the later finishing will not be cumbersome.

(3) The repaired product will not lose the original datum.

3. Electric spark surfacing repair machine, representative model: zy-12 intelligent electric spark surfacing repair machine

The principle of the cold welding machine: at the moment of contact between the welding material and the workpiece, high-temperature (generally about 2000 degrees) ion clusters are generated on the surface of the welding wire through high-frequency, high pulse and large current. After the tip of the welding material is ionized, it is fused and welded on the surface of the workpiece by deposition surfacing to quickly form a repair surfacing layer. To be exact, this is a special surfacing process, and the heat is strictly controlled in the contact area, which has no effect on the workpiece matrix.

The main advantages of the electric spark surfacing repair machine are:

(1) After welding, there are no hard spots and & ldquo; White mouth & rdquo;.

(2) After welding, there will be no problems such as undercut, deformation, large color difference and no stress.

(3) It can repair copper, aluminum, zinc, gray iron, ductile iron, cast steel and other materials.

(4) It can be directly processed on the machine tool (its hardness after welding is hrc15 & deg; - 30 & deg.