Spot welding guns are usually specifically designed to fit only the specific assembly being joined. Typically there are several basic kinds of spot welders are available, both of which are very common, both of which are the main two types are currently available, the latter usually referred to as the “C” -style gun, in which the working electrode is permanently attached to the moving connector. In both the above types of welds there is a secondary welding element attached to the assembly being joined. This element acts as a shield from airborne particles that would otherwise affect the welding process. The primary welding element is typically a TIG (Tungsten Inert Gas) wire, which is protected by a welding shielding gas.
A common pit type of spot welding gun is known as the MIG, or Metal Inert Gas, gun. One primary advantage of the MIG is that it has a very high cycle time, often in excess of forty seconds. This is desirable when attempting to weld heavy pieces of metal, because the high cycle time means an increased amount of weld per cycle, which leads to an increase in weld quality and consistency. MIG welding is very good at welding aluminum, tin, copper and other metals with a smooth or semi-smooth surface.
A gas tumbler gun, also called a drag operator, is used to weld thinner materials, typically using a fan-wheel or similar rotating mechanism. Because the tumbler is able to move continuously in one direction, this produces a very consistent weld. Drag operator spot welding guns tend to have shorter cycle times than most other spot welding guns. This is important when you are welding thinner materials because you want as little scrap as possible, so a lower cycle time is necessary.
The most cost-effective type of welding gun is one that uses shielded electrodes. Using shielded electrodes means that you will have significantly less welding surface material to work with. In general, shielded electrodes produce a much more consistent weld than do shielded electrodes. While shielding electrodes can be more prone to contamination and increased stray welds, they usually produce a much smoother weld. This makes them an excellent choice for low-maintained operations and for use by inexperienced welder.
Some of the best welders on the market today use what are known as robots to do their welding. The most advanced robotic spot welding guns will actually do the entire weld on their own, eliminating the need for live wire. However, high demand situations may make it impractical to maintain the battery charger on a robot welding gun constantly. If the battery dies out in your welding line, it can prevent you from completing your job, so it is important to keep a backup supply of charged batteries on hand at all times.
The final type of spotting gun is the gun body type. A gun body is simply the container that holds the molten metal. This type of machine will require you to clean the gun body between each use in order to remove any residual corrosive or hazardous materials. You can purchase a robot weld gun body separately, or you may want to buy one of several styles that attach to the end of a robot arm. You can also purchase a gun frame that attaches to an arm, if you would prefer to eliminate the need for welding gun body altogether.