How To Test The Performance Parameter Of ERW Steel Pipe Welding Machine
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How to Test the Performance Parameter Of ERW Steel Pipe Welding Machine

Performance parameter testing of ERW steel pipe welding machine

(1) the welding current and the polarization time testing: before delivery, the new resistance welding machine must pass the regulation test of the project, including the no-load test and short-circuit test to determine whether the resistance welding transformer and the performance of the welding machine is meeting the standard. And the No-load test and short-circuit test requires special test equipment. At the scene of the welder use, it can use resistance welding large current measuring instrument to test the secondary short circuit current (electrode directly contact) or welding current (electrode with artifacts in) and the polarization time. Resistance welding current meter is a kind of special instrument. Get electromagnetic signals generated by the induction coil (sensor) in the secondary circuits, and then through transformation circuit, show the current value and time value in digital form.

(2)the secondary loop dc resistance test for a specific welder, secondary loop size is fixed, so the impedance is a constant. Only the resistance shall increase due to the thickening of the contact surface oxidation film and the looseness of the bolt. The increase of secondary loop resistance will make the welder secondary short circuit current value (or welding current value) decrease, which may reduce the welder welding ability. So, the secondary loop should get cleaning and inspection after long-term use.

Secondary loop dc resistance test method: directly measure by micro-ohmmeters or external dc power supply can also be used for secondary circuit by measuring current and voltage drop and converting it into resistance value.

(3) For general pneumatic welding machine, as the pressure is produced by the cylinder, the the pressure of the compressed air connected to the cylinder is in proportion to the cylinder pressure. Can establish curves between the electrode pressure and compressed air pressure, detection electrode pressure regularly, and make contrast.

Electrode pressure detection method of ERW steel pipe welding machine has the following kinds:

(1) the dynamometer made of the u-shaped spring steel, according to the known curve of deformation and stress, we can learn pressure value from the dial indicator.

(2) with the ball indentation.

Take a steel ball with proper diameter and a flat steel or copper, firstly measure the curve of indentation diameter and pressure on a materials testing machine, and then compare the measured indentation on the welding machine with the same steel plate and steel ball and shall get the stress value of the welding machine.

(3) direct determination with the dynamometer composed of resistance strain slice and the corresponding instrument.

(4) special mechanical dynamometer is used to test.


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