The influence of welding frequency on welding quality
Welding is vital for the quality of the high frequency welded pipe. Since the high frequency influence the distribution of current in the steel plate, high frequency welding frequency has a great influence to welding.
Selecting high frequency or low frequency welding is mainly influence the welding heat affected zone size.From the point of efficiency of welding, pipe manufacturers should as far as possible to use higher frequency.100 KHZ high frequency current can penetrate ferritic steel 0.1 mm, but can only through the 0.04 mm 400 KHZ, which means that the latter current density distribution on the surface of the steel plate is nearly 2.5 times higher than the former one.
In the production practice, the welding manufacturers generally selected 350 KHZ to 450 KHZ frequency welded carbon steel material.When welding alloy steel material, welding more than 10 mm thick steel plate, pipe manufacturers can use 50 KHZ to 150 KHZ frequency, because of alloy steel containing chromium, zinc, copper, aluminum and other elements of the skin effect and the steel has some difference.
Now foreign high-frequency equipment manufacturers are mostly USES the new technology of solid state high frequency, set the frequency range, according to the thickness of the material, when welding the unit speed of curve track and adjust the frequency.
Selecting high frequency or low frequency welding is mainly influence the welding heat affected zone size.From the point of efficiency of welding, pipe manufacturers should as far as possible to use higher frequency.100 KHZ high frequency current can penetrate ferritic steel 0.1 mm, but can only through the 0.04 mm 400 KHZ, which means that the latter current density distribution on the surface of the steel plate is nearly 2.5 times higher than the former one.
In the production practice, the welding manufacturers generally selected 350 KHZ to 450 KHZ frequency welded carbon steel material.When welding alloy steel material, welding more than 10 mm thick steel plate, pipe manufacturers can use 50 KHZ to 150 KHZ frequency, because of alloy steel containing chromium, zinc, copper, aluminum and other elements of the skin effect and the steel has some difference.
Now foreign high-frequency equipment manufacturers are mostly USES the new technology of solid state high frequency, set the frequency range, according to the thickness of the material, when welding the unit speed of curve track and adjust the frequency.
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