Portable spot welding machines provide welders with the ability to weld at higher amperage and allow for more flexible working parameters. The power utilized to drive these machines is provided by electric, gasoline or even diesel engines. Welding spot machines offer several advantages over their stationary counterparts.
With a portable welding system you can combine more than two metals that have similar alloys. Through heating and applying continuous pressure to the welded spot, portable spot welders are able to fuse multiple thin metal sheets together permanently. The term portable in this welding technique refers to the central welding area where the continuous heat and pressure applied are transmitted. This technique is extremely useful for combining several types of metal without the need for costly and complicated welding equipment.
The most basic machine in a spot welding operation consists of a welding gun similar to those used for plasma cutting. The welding gun heats the gases and the thin metal sheets that are required for joining. The welding gun provides inert shielding that prevents both the welder and the filler from contamination. Various kinds of electrodes are available for use in the spot welding process. The most popular are the nickel electrodes used for soldering metal sheets with nickel-zinc alloy, titanium electrodes, copper electrodes and stainless steel electrodes.
The main characteristic of a highly efficient welding machine is that it is compact, lightweight, and highly portable. In most instances, only a single welding machine can be used to perform a variety of tasks due to the various wires required to feed the material through the machine. This results in reduced downtime, because only one machine is required to perform many jobs instead of several to achieve the same goal. A highly efficient machine should also have excellent feed rates because it is necessary to keep the heated gases flowing at all times. The metal being welded is kept clean by passing air or compressed air through the nozzle to help avoid contamination.
A portable welding system must have excellent feed rates if it is to perform well because the metal sheet will have to travel long distances without the possibility of contamination occurring. Some portable units have built-in fans that can help cool down the area while the metal is being fed. A properly built-in fan will ensure that the entire area is kept uniformly heated and cooled so there is less work that needs to be performed to keep the entire machine operational.
A fully charged battery spot welder is highly recommended for use in mobile welding environments. Most portable units are built to withstand falls, accidents, and exposure to electricity. Some units will automatically shut off their welding when the battery pack is full. There are some welders that are able to be charged by charging the battery pack through a USB port. If the portable welding machine that is being purchased has this option, it is important that the buyer purchase a unit that uses a high quality charger.