Pulse Patch Welding

Pulsed Patch Welding, also known as Pulsed Arc Welding, is an advanced welding technique that is a type of arc welding. It is based on the traditional welding method and introduces pulsed current control, which allows the arc to show short bursts and intervals during the welding process, resulting in a series of pulsed welding processes.

In pulse tack welding, the current is not supplied continuously, but in the form of short bursts of high current pulses followed by a pause. This "on-off" mode of current control can effectively improve the metallurgical reaction in the welding process, improve welding efficiency, reduce the heat-affected zone, reduce weld distortion, improve weld quality, but also reduce the weld heat input, reduce weld residual stress, thus applying to some of the higher requirements of the material properties of the occasions, such as precision Metal structure parts, aviation, aerospace, automotive industry, etc..

Pulse filler welding technology can also be used for welding thin plates and fine wires, as it prevents the heat affected zone from being too large and avoids excessive melting and burn-through of the material. In addition, due to its precise control, pulse tack welding is also commonly used for repairing and reinforcing parts, such as localized repairs in structures such as ships and bridges.

Overall, pulse tack welding is a highly efficient, precise and low heat input welding technology that can meet the demand for high quality and high precision welding in modern industry.

Technical Advantages of Pulsed Replacement Welding

Pulse welding technology has the following major technical advantages:

1. High welding quality: the short-time high energy output of pulse current can complete the welding in a short period of time, which reduces the heat input and thus produces a smaller heat-affected zone, reduces welding deformation and improves the mechanical properties and surface quality of the weld.

2. High accuracy: pulse welding can accurately control the opening and closing of the current, which helps to control the shape and size of the molten pool, so as to achieve the ideal welding effect, especially suitable for thin plates, precision parts and complex structures welding.

3. Small thermal stress: due to the low heat input, the welding process produces less thermal stress, which is conducive to improving the fatigue strength of the welded parts and crack resistance, reducing the correction work after welding.

4. Fast welding speed: pulse welding speed, improve the production efficiency, and because of the flexible operation, can realize automation, suitable for mass production.

Pulse refinishing vs. Conventional refinishing 

Pulse refinishing is different from traditional refinishing in the following aspects.

1. Welding current form: traditional refinishing usually uses a continuous constant current, while pulse refinishing is an intermittent pulse current, where the current bursts for a short period of time and then pauses, forming an "on-off" pattern. 2.

2. Heat Input: The heat input of pulse tack welding is lower because the current is not supplied continuously, which makes the temperature control in the welding area more precise, reduces the heat affected zone, and has less effect on the deformation of the workpiece and the residual stresses.

3. Welding speed and efficiency: due to the high frequency and short duration high energy of pulse welding, it is usually faster and more productive than conventional patch welding.

4. Welding quality: pulse welding can generate smaller depth of fusion and narrower weld width, the surface quality of the weld is usually better, with fewer defects and distortions.

5. Welding control: Pulsed patching allows for more precise control of current and time, which is especially significant for welding complex shapes or thin plate materials, resulting in more uniform and consistent weld results.

6. Environmental impact: Due to the low heat input, pulse patching produces less fumes and noxious gases and has a lower impact on air quality.

7. Scope of application: Although traditional patching is widely used in general welding, pulse patching, because of its characteristics, is more suitable for occasions with high requirements for quality and precision, such as precision parts, aviation, aerospace and other fields.

Overall, pulse refill welding is a relatively advanced welding technology, which has significant advantages in enhancing welding quality, reducing heat impact and improving productivity.

Example of refinishing