What is a portable welding machine?

Working principle
AC welding machine: It is a high-power transformer. It uses the principle of inductance to reduce the voltage and increase the current of ordinary AC through the transformer. It uses the high-temperature arc generated when the positive and negative poles are short-circuited in an instant to melt the solder on the welding rod and the iron material to be welded, so as to achieve the purpose of combining them.
DC welding machine: The current and voltage are stepped down by the three-phase main transformer, rectified by the thyristor element, and the output current is controlled by changing the phase of the thyristor trigger angle. The current signal is taken from the shunt at the DC output end of the rectifier as the current negative feedback signal. As the DC output current increases, the negative feedback also increases, the thyristor conduction angle decreases, and the output current and voltage decrease, thereby obtaining the descending external characteristics, making the welding process more stable.
Features
Strong portability: Small size, light weight, usually equipped with a portable handle or shoulder strap, convenient to carry to different work locations, such as different rooms indoors, outdoor construction sites, aerial work platforms, small spaces, etc., to meet various mobile welding needs2.
Simple operation: Equipped with an intuitive operating interface and control buttons, some also have a dual digital display function, which can accurately display the current and voltage values. Even beginners can quickly get started and easily adjust welding parameters, such as current size, thrust, etc., to adapt to different welding tasks.
Diverse functions: It has a variety of welding functions, such as manual arc welding (MMA), tungsten inert gas welding (TIG), etc., which can meet the welding needs of various metal materials such as iron, copper, aluminum, stainless steel, etc., and can also weld plates of different thicknesses3.
High safety: Multiple safety protection functions are designed, such as overheating protection. When the internal temperature of the welding machine is too high, it will automatically stop working to avoid fire and other dangers caused by overheating; the leakage protection function can cut off the power supply at the moment of current leakage, effectively preventing electric shock accidents.
Main types
Inverter portable electric welding machine: Using inverter technology, the industrial frequency AC is rectified and filtered into DC, and then the DC is converted into medium frequency AC through power devices such as IGBT, and then converted into DC output again after transformation, rectification and filtering. It has the advantages of small size, light weight, high efficiency and good welding performance. It is a more common type of portable welding machine on the market.
Transformer-type portable welding machine: The input high voltage is converted into a low voltage suitable for welding through a transformer. It has a relatively simple structure, high reliability and relatively low price, but it is large in size and weight and relatively low in efficiency.
Application scenarios
Home repair and DIY: It can be used for the repair of metal objects in the home, such as the reinforcement and repair of doors, windows and furniture. It is also suitable for DIY enthusiasts to make metal crafts and small metal structures.
Auto repair: In auto repair, it can be used to weld and repair and modify metal parts such as car frames, body parts, exhaust pipes, etc.
Construction and decoration: It is suitable for steel structure welding and pipeline connection at construction sites, as well as the installation of metal doors and windows and the welding of metal decorative lines during decoration.
Field operations: In scenes such as outdoor adventures and field engineering construction, portable welding machines can play an important role when temporary welding and repair of metal equipment and tools are required.