How to control the operating temperature of a pipe welding machine?
Publish time:
2021-11-09
In the market, the straight seam welding pipe unit feeds the strip into the pipe welding machine. After multiple passes of rolling by rollers, the strip is gradually rolled up to form a circular tube blank with an opening gap. The pressure of the extrusion rollers is adjusted to control the welding seam gap to 1~3mm, and make both ends of the weld joint flush.
In the market, straight seam welding pipe units feed strip steel into the pipe welding machine. After multiple passes through rolling mills, the strip steel is gradually rolled up to form a circular pipe blank with an opening gap. The pressure of the extrusion rollers is adjusted to control the weld gap to 1-3mm, and to make both ends of the weld joint flush. If the gap is too large, the proximity effect will be reduced, the eddy current heat will be insufficient, and the intergranular bonding of the weld seam will be poor, resulting in unmelting or cracking. If the gap is too small, the proximity effect will increase, the welding heat will be excessive, causing weld burn; or a deep pit will be formed after the weld seam is extruded and rolled, affecting the surface quality of the weld seam.
The welding temperature of the pipe welding machine is mainly affected by the high-frequency eddy current thermal power. The high-frequency eddy current thermal power is mainly affected by the current frequency. The eddy current thermal power is proportional to the square of the current excitation frequency; while the current excitation frequency is affected by the excitation voltage, current, capacitance, and inductance.
According to the above, the excitation frequency of the straight seam welding pipe machine is inversely proportional to the square root of the capacitance and inductance in the excitation circuit, or proportional to the square root of the voltage and current. By changing the capacitance, inductance, voltage, or current in the circuit, the magnitude of the excitation frequency can be changed, thereby achieving the purpose of controlling the welding temperature. For low-carbon steel, the welding temperature is controlled at 1250-1460℃, which can meet the requirements of weld penetration for a wall thickness of 3-5mm. In addition, the welding temperature can also be achieved by adjusting the welding speed.
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