Handheld active control type spot welder for planting nails

Abstract

The invention discloses a handheld active control type electric welder. The electric welder comprises a power module and an operation handle, wherein a main control panel, a charging / discharging circuit, a power output board and a welding head are fixedly arranged on the operation handle; the charging / discharging circuit comprises a charging switch and a plurality of charging / discharging units arranged in parallel; each charging / discharging unit comprises an electrolytic condenser and a discharging switch; each of the charging switch and the discharging switch is an MOSFET tube. The handheld active control type electric welder disclosed by the invention has the advantages of high integration degree, small size, low cost and the like, and can realize the active control of the output time of welding current, so that the success rate of welding is increased; the electric welder adopts the confluence of the parallel charging / discharging units, so that each MOSFET tube is guaranteed to normally work; besides, the large current for welding is satisfied, so that the MOSDET tubes can be used for controlling large current.

Description

technical field [0001] The invention relates to a nail implanting welding machine and a spot welding machine, in particular to a hand-held active control nail implanting spot welding machine. Background technique [0002] In today's automobile technology, in order to pursue fuel saving, energy saving, and carbon reduction, the development of lightweight is the general trend. All car manufacturers use aluminum alloy or ultra-high-tensile steel to reduce vehicle weight in new models. The above two new materials The use of automotive maintenance equipment also brings new challenges. The advancement of ultra-high-tensile steel can obtain the same or higher body strength than traditional iron body with thinner and lighter sheet metal. This material requires less heat input due to the reduction of sheet thickness during welding. Avoid the deformation of the plate due to overheating. Once the heat input is too high, the plate is easily oxidized, and it is easy to cause rust proble...

AI Technical Summary

Problems solved by technology

The disadvantages of the capacitive welding machines currently on the market are: 1. Large size, heavy weight, low integration, unhandy, and poor portability; 2. In addition to the host, welding guns and ground wires are required, and the cables between welding guns and ground wires are thick and heavy. , not only the cost is high, but the range of operation is also limited by the length of the cable; 3. The instantaneous output current is large and the output time is extremely short, but because of the use of a semi-controlled component such as a thyristor as a discharge switch device, the output time is uncontrollable. For thin plate welding, such as ultra-high tension steel plate welding, either the output power is too large to cause black penetration, or the output power is too low to cause weak welding and low success rate; Consumption, it is necessary to use multiple large electrolytic capacitors in parallel, the capacitance is large, because the input and output currents are large during charging and discharging, so the charging and discharging resistors are large in size, high in heat generation, and high in energy consumption; 5. Due to the uncontrollable output time, Difficult to perform iron meson spot welding function, so it is impossible to repair the iron body

[0006] Since the output current of the capacitive electric welding machine can reach thousands of amperes, which is far greater than the maximum current of the commonly used full control component - MOSFET (MOSFET), if the MOSFET is used for control, multiple MOSFETs must be connected in parallel Shunt, but the existing welding machine structure and process can not realize the balanced shunt of field effect tubes, and it is easy to burn the field effect tubes. Therefore, the existing capacitive welding machines only use the semi-controlled silicon controlled components with large overcurrent control Electrolytic Capacitor Charging and Discharging

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