The second-hand high-frequency pipe welding machine often has problems during the welding process, and no serious welded pipe quality is found. Below we will analyze the matching that affects the welding process of the second-hand high-frequency pipe welding machine. Mainly affecting the welding process of the second-hand high frequency welded pipe machine can be divided into 4 types.

1. Matching at all power levels

In the actual production process, welding speed (vehicle speed), welding frequency, welding power, opening angle size, resistor position, resistor working condition, magnetic flux size, steel strip thickness, welded pipe diameter, cooling water temperature, and even Deburring and the habits of operators in different teams all affect load matching. Therefore, continuous maintenance of the best matching is a prerequisite to ensure the consistent welding quality of the welded pipe.

 

2. Can the voltage inverter welding machine perform load matching accurately?

Most voltage inverter welding machines perform load matching by changing the contact points on the RF transformer. If you want to perform load matching, you need to continuously change the contacts of the transformer, which is basically impossible to adjust when the welding machine is working continuously.

The current inverter welding machine, through the automatic matching system, the load matching is automatically maintained, without the participation of the operator, the welding machine can always work in the best load matching state, ensuring stable welded pipe weld quality.


3. Parameter matching of welding frequency

From the perspective of the development of second-hand high-frequency pipe welding machines, the frequency around 400KHz has been proven to be the best frequency for the induction welding process. The welding frequency determines the width of the steel strip and the amount of extrusion. These parameters are all necessary conditions for achieving good welding quality. High frequency can reduce the depth of current penetration. This phenomenon is called "Skin Effect". The skin effect concentrates the heat on the edge of the weld near the surface, achieving high-quality forging welding with the least amount of extrusion. On the contrary, the low frequency causes more areas of the weld edge to be heated, and in severe cases, it will cause embrittlement of the cast weld. The welding frequency and the set parameters of the unit also affect each other, such as forming, opening angle and other roll geometric parameters. In addition, the high-frequency welding process will be more sensitive to the setting of the above parameters in the low-frequency state. If the cooperation is not good, it can cause more unqualified products and unstable welding quality.

 

 

4. The mechanical parameters of other units are related to frequency matching

The performance of the impedance device also depends on the frequency. All resistors are limited to the saturation magnetic flux density, which is the so-called magnetic flux conductivity. If this limit is exceeded, the resistor will stop working. The magnetic flux in the impedance device changes with the frequency conversion. For example, a normally working impedance device will withstand twice the magnetic flux at 200KHz than at 400KHz. Reducing the welding frequency may require additional impedance materials (magnetic rods). When welding small-diameter thick-walled tubes, the quality and magnetic flux of the impedance (magnetic rods) are particularly important due to the limitations of actual space conditions.

The above is the matching that affects the welding process of the second-hand high frequency pipe welding machine, and I look forward to your assistance. Our company focuses on second-hand welded pipe equipment suppliers. If you need to buy second-hand welded pipe equipment, welcome new and old customers to consult and purchase.