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Welding parameter selection

Release time: 2017-06-12 11:10:29

When using carbon dioxide gas shielded welding, the welding specification is generally relatively small, that is, low arc voltage and smaller welding current. The main specifications are: arc voltage, welding current, welding circuit inductance, welding speed, gas flow and dry wire elongation.
       1, arc voltage and welding current.
       The arc voltage is one of the key parameters in the welding specification. Its size determines the length of the arc, which determines the droplet transition form. One of the conditions to achieve a short circuit transition is to keep a short arc length. Therefore, in the welding specification, short-circuit transition is an important feature of low voltage.
The matching relationship between the welding current and the arc voltage should be taken into account when determining the arc voltage. In the wire diameter and welding current, the arc voltage is too low, the arc ignition is difficult and the welding process is unstable. The arc voltage is too high, transition from short circuit to long arc, and the welding process is unstable. Only when the arc voltage and welding current match well, in order to obtain a stable welding process, the welding process is small, the weld forming. When the current is less than 300A, the welding voltage and current follow: U = 0.04i + 16 (1.5 +)
       2, welding circuit inductance.
       The inductance of the welding circuit directly affects the growth rate of the short circuit current. Therefore, the growth rate of the short circuit current can be adjusted by adjusting the inductance of the welding circuit to control the burning time of the arc and control the penetration depth of the base material.
      3, welding speed.
      Welding speed will cause welding on both sides of the weld, welding speed is too slow, easy to produce welding defects, such as thick, so to ensure the quality of welding, you need to choose the appropriate welding speed.
      4, the wire dry elongation.
      As the short-circuit transition welding used in the wire is thin, the length of the wire resistance has become an important factor in the welding process can not be ignored. With the increase in wire length, the resistance heat flux increases, the wire melting rate, from the increase in productivity which is useful point of view, but when the stem elongation is too large, the wire is easy to overheat and fuse, splash serious, welding process instability. The dry shrinkage of the wire will shorten the distance between the nozzle and the workpiece, and the metal splash is easy to plug the nozzle.
       5, gas flow.
       The larger the current, the welding speed, the longer the extension length of the wire, and the outdoor work at the time of welding, so that the gas flow is increased appropriately, so that the gas has sufficient rigidity and the anti-interference ability is improved. But the gas flow is too large, shielding gas flow increases, but the external air into the welding area, the protection effect changes, and even cause the pores of the weld.
       6, the polarity of the power supply.
      In the thin plate welding, usually using the DC reverse (reverse polarity), that is, welding parts of the cathode, wire anode. Due to reverse polarity, small splash, arc stability, good shape.




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