What factors should be considered in the purchase of welding machine

01 Introduction of electric welding machine

The welding machine uses the high temperature arc generated by the positive and negative poles when the short circuit is instantaneous to melt the solder on the electrode and the material to be welded, so that the purpose of the contact matter is combined. Its structure is very simple, is a high-power transformer. Welding machine generally according to the type of output power can be divided into two kinds, one is AC power, one is direct current. They use the principle of inductance, the amount of inductance when switched on and off will produce a huge voltage change, using the positive and negative poles in the instant short circuit generated by the high-voltage arc to melt the solder on the electrode, so that they achieve the purpose of atomic bonding.

01 Advantages and disadvantages of welding machine

1 Advantages

Welding machine uses electric energy, converts electric energy into heat energy instantly, electricity is very common, welding machine is suitable for working in a dry environment, do not need too many requirements, because of small size, simple operation, easy to use, fast speed, welding seam strong and other advantages are widely used in various fields, especially for the high strength of the parts are particularly practical, The same metal material can be instantly connected (it can also be connected to dissimilar metals, but the welding method is different), and the weld after heat treatment, the same strength as the base material, and the seal is very good, which solves the problem of sealing and strength for the manufacture of storage gas and liquid containers.

2 Disadvantages

Welding machine in the use of the process will produce a certain magnetic field around the welding machine, arc burning will produce radiation around, there are infrared, ultraviolet and other light in the arc, as well as metal vapor and smoke and other harmful substances, so the operation must do enough protective measures. Welding is not suitable for the welding of high carbon steel, due to the welding weld metal crystallization and segregation and oxidation process, for high carbon steel welding performance is poor, easy to crack after welding, resulting in hot cracks and cold cracks. Low carbon steel has good welding performance, but the process should also be properly operated, rust cleaning is more cumbersome, sometimes the weld will appear slag cracks, pores and other defects, but proper operation will reduce the production of defects.

03 Model of welding machine

1 Category, purpose code

A- Installation cable, B- insulated cable, C- Marine cable, K- control cable, N- agricultural cable, R- flexible cable.

U-mining cable, Y-mobile cable, JK-insulated overhead cable, M-coal mine, ZR-flame retardant type, NH-fire resistant type.

ZA-A flame retardant, ZB-B flame retardant, ZC-C flame retardant, WD-low smoke halogen-free type.

2 Conductor Code

T-copper wire, L-aluminum core.

3 Insulation layer code

V-pvc plastic, YJ-XLPE insulation, X-rubber, Y-polyethylene material, F-Teflon.

4 Protective layer code

V-PVC sheath, Y-polyethylene material, N-nylon sheath, P-copper wire braided shield, P2-copper tape shield, L-cotton yarn braided wax coating, Q-lead pack.

04 Classification of welding machine

1, the main welding machines used by industrial and mining enterprises are: AC arc welding machine, DC welding machine, argon arc welding machine, carbon dioxide protection welding machine, butt welding machine, spot welding machine, submerged arc welding machine, high frequency welding machine, flash butt welding machine, pressure welding machine, collision welding machine laser welding machine.

2, there are two kinds of DC welding machine: one is the AC motor based on the addition of rectifier components, and the other is the DC generator. Dc welding machine mainly welding non-ferrous metals, pig iron. Ac welding machine mainly welding steel plate.

3, argon arc welding machine, carbon dioxide protection welding machine, high frequency welding machine, flash welding machine. Argon arc welding machine, carbon dioxide gas welding machine can mainly weld 2MM or less thin sheet and colored gold layer. Flash butt welding machine mainly butt copper and aluminum joints and other objects, high frequency welding machine mainly pipe factory welding steel pipe.

4, submerged arc welding mainly welding steel structural parts, bridge H steel, I-room girder and other thick steel structural materials.

5, gas shielded welding machine: argon arc welding, carbon dioxide shielded welding, under the protection of gas welding machine will not oxidize, solder solid, can weld colored gold layer, can weld thin materials.

6, laser welding machine: can weld the lead inside the transistor.

7, butt welding machine: cable chain factory main welding anchor on the iron cable and other objects. Can butt yuan steel and so on.

05 Selection of welding machine

1, in the purchase of welding machine products, to the regular production enterprises or large shopping malls to buy, and to buy a high market share of the brand famous products. Do not covet cheap to buy in small shops, where the quality of the welding machine can not be guaranteed.

2, when purchasing, check whether the nameplate on the product has the name of the manufacturer, production address, specifications and models, welding current adjustment range, load duration and input voltage and current and other content, and then determine the welding machine you want to buy according to the work needs.

3, the purchase can require the dealer to provide product quality inspection report or certificate. Because the welding machine product is a national mandatory certification product, it is necessary to confirm whether the product has passed the "3C" certification when purchasing. You can also check online.

4, when buying, be sure to check whether the product has a ground screw, and the connection of the ground screw should be well grounded without paint. Whether the movement is clean, whether the insulation is damaged to ensure the safety of use, and if necessary, it can also be tested.

5, before purchase, you can check the operation, conversion and installation of the switch on the panel, the power indicator light on and off, whether the fan is normal, whether the power part has abnormal vibration and buzzer, whether there is odor, whether there is discoloration and other heating phenomena on the appearance, to ensure the quality of the welding machine and give full play to the performance of the welding machine.

6, if you want to buy a gas shielded welding machine, before purchase, check whether the accessories are complete, whether the wire feeder is greasy, whether the rotation is smooth, whether the connection cable matches the exterior insulation is damaged, to ensure the stability of the arc.

06 Maintenance of welding machine

1, welding machine motor remember not to be damp, storage must be placed in a dry place. Storage should be covered with tarpaulin to prevent moisture intrusion.

2, whether in storage or operation must try to avoid dirt, water droplets, metal or other debris intrusion.

3, do not cover other debris on the motor during operation, so as not to hinder heat dissipation and cause the motor to overheat and burn out.

4, always pay attention to the heating of the motor, pay attention to the current and voltage do not overload.

5, always check the collector ring has normal sparks, if there is abnormal sound when the motor is running, it should be checked immediately.

6, silicon rectifier elements should be kept well ventilated, radiator and cover shell shall not be covered by items that prevent heat dissipation.

7, often clean up the grime of each part, check the fastening screws to prevent loosening.

8, regularly check whether the control line is welding, broken head, screw loosening and so on.