A 140 A MMA inverter welder based on the latest generation of IGBT transistors. It uses a breakthrough in the welding equipment market in the form of a specially designed microprocessor that autonomously manages the entire welding process. The reduction of logic circuits and the proprietary sampling of welding current not only reduce the failure rate of the device, but above all make the welding process itself much easier. The ease of achieving a high-quality weld is appreciated by both professionals and those with little experience.

Designed by our factory and manufactured in Taiwan, the microprocessor is based on the ARM4 architecture in 55 nm technology, clocked at 200 MHz in 32-bit. It allows the latest generation of transistors to be controlled at speeds of up to 70 kHz, almost twice as fast as comparable devices. It has a proprietary solution for analysing welding parameters at approximately two hundred million times per second. It removes the need to place additional circuits for functions such as ARC FORCE, ANTI STICK or HOT START. The absence of additional circuits means that the impact of interference generated in the current transformation process on welding quality is marginal, unnoticeable to the user.

Basic information:

• Welding current: 30-140 A
• Recommended electrode diameter: 1.6 – 3.2 millimeters
• Electrode holder up to 200 A, cable cross-section 10^mm2, length 1.8 metres
• Ground bracket up to 150 A, cable cross section 10^mm2, length 1.2 metres
• Power supply cable: H07RN-F 3G1.^5mm2, length 2.4 metres
• Efficiency: 80%
• Power factor: 0.73
• Adjustable shoulder strap
• Dimensions: 267x128x207 mm
• Weight: 3 kg

Functions:

• Real Hot Start
• Real Arc Force, self-adjusting
• Anti stick
• VRD
• Intelligent protection against overload and overheating
• Cooling fan on demand

Description of the function:

Real hot start - when the electrode is applied to the material to be welded, the welder increases the welding current for a fraction of a second, making it much easier to strike the arc. The YT-81355 model does not have built-in parameter adjustment for this function. They are pre-set for the most common type of electrode on the market, i.e. rutile electrodes.

Real Arc force - adjusts the arc dynamics according to the distance of the electrode from the workpiece. The multitasking microprocessor used in YT-81355 examines the welding parameters approximately two hundred million times per second. It analyses the measurement results in real time. Then, controlling the transistors at up to 70,000 times per second, it increases or decreases the welding current. Everything happens in a fraction of a second, and the aim of these actions is to obtain the best quality welding source for a given current setting. The YT-81355 model does not have built-in parameter adjustment for this function. They are pre-set for the most common type of electrode on the market, i.e. rutile electrodes.

Anti stick - cuts off the welding current when the electrode is short-circuited, allowing the electrode to be detached from the weld material.

VRD - the function lowers the idle voltage from around 60 V to a safe level for humans. Despite the significant impact on security, the function is often deactivated by users. The reason for this is due to problems with arc ignition, especially among those with little experience. Most inverter welders test the output current using analogue sensors, which telegraphically increases the response time and consequently makes arc ignition more difficult. The microprocessor in the YT-81355 does it differently. It generates a waveform of approximately 200 MHz in the welding current circuit. It examines, in real time, the deformation of the run, which varies according to the welding stage in question. The moment the electrode touches the workpiece, it is detected in a fraction of a second, then the VRD function is switched off, at the same time HOT START starts. The problem of arc ignition does not occur. The YT-81355 model has the VRD function permanently enabled.

Protection against overload and overheating (fan on demand) - the microprocessor in YT-81355 tests the temperature of critical components in real time. Depending on the temperature, it controls the fan speed first, but when the temperature reaches too high a level, the microprocessor smoothly reduces the output current, allowing the electrode to burn out or the weld to be terminated in a controlled manner. In most welding machines on the market, the moment of overheating means that the welding current is immediately switched off, often ending up with the need to make mechanical adjustments to the parts being welded. This problem does not occur with YT-81355.