Arc welding machine and say arc welding transformer, is a special kind of transformer, the web voltage of alternating current into a suitable for welding of low voltage ac, by the main transformer and the adjustment of the part and instructions equipment etc.
Arc welding machine is mainly a moving iron core type, with the asanas and moving coil type 3 kinds. It is simple in structure, easy to fix, made low cost and high efficiency. But the current waveform for sine wave, output to exchange the decline characteristics, arc stability is poorer, power factor is low, but arc blow phenomenon seldom produce, no-load loss small, commonly used to hand arc welding, submerged arc welding and tungsten extremely argon arc welding method.
(1) arc welding machine should be far away from combustible and explosive substances; Arc welding machine with the installation environment conditions should be adapted to; Arc welding machine should avoid damp, and prevent the foreign body in.
(2) arc welding machine shell should be reliable meet protection conductor; In order to prevent high pressure into the dangers of low pressure, arc welding machine secondary side a point should also meet protection conductor.
(3) arc welding machine a rated voltage should be consistent with the power supply voltage; Current work shall not exceed the corresponding rate of temporary load under allowable current.
(4) arc welding machine should be the terminal row connection; Wiring should correctly, should avoid to produce harmful circulation.
(5) many sets of welding machine should as far as possible the lead evenly in three phase power, try to keep three phases balance.
(6) the arc welding machine, a second power all should adopt copper heart rubber cable (rubber set of soft line); A line length is unfavorable exceed 2 ~ 3 m.
(7) arc welding machine, a secondary coil insulation resistance qualified.
(8) mobile welding power must be.
(9) in electric shock risk big environment homework, arc welding machine secondary side arc automatic power out should be installed devices.
(10) arc welding operations shall wear insulating gloves, working clothes, shoes, such as mask protective equipment; In the metal container work, also should wear a helmet, protective appliances like elbow pairze pads, etc.
1. The CO2 welding through ability, welding current density (100-300-A/m2), little deformation, the production efficiency than electrode arc welding high 1-3 times
2. CO2 gas cheap, the workpiece before welding of cleaning will keep it simple, it costs only electric arc welding electrode of 40% 50%
3. Weld resist rust ability, including hydrogen content low, and cold crack tend to small.
4. Welding process of metal splash more, especially when the process parameters adjustment don't match, particularly serious.
5. Not easy oxidation of welding of metal materials, wind ability is poor, field operations or leakage day work, need to have wind measures.
6. Welding arc is strong, pay attention to arc radiation.
Three, metallurgy characteristics
The welding process in metallurgy CO2 is mainly displays in:
1. The CO2 gas is a gas oxidation and under high temperature decomposition, has strong oxidation, the burning of the alloy element or cause porosity and splash, etc. Solve CO2 oxidizing measures is deoxidization, particular way is in the welding wire with a certain amount deoxidizer. Practice show that the Si-Mn deoxidizing effect is best, so is now widely used H08Mn2SiA H10Mn2Si welding wire, etc.