How an Electric Spot Welding Machine Works
A spot welding machine also known as a thermal resistance welder is a type of electrical panel welder that uses electricity to join and weld together multiple sheet metals. The welding equipment consists of a welder, electrodes, shielding gas and a filler rod. The main purpose of the weld is to join and solder a piece of metal together by melting and fusing the filler rod. It produces a smooth, even and strong joint.
This type of welding process can be used for a variety of applications and the welder basically supplies the power, energy and freedom to combine and weld two materials together without the need for a shielding gas. The common place for a spot welding machine to be used is to join together sheets of steel or aluminium where a tolerance of only a couple of millimetres or less is required. Most machines require only two points to operate such as a taper or a blade with the welding process taking place at either side of the joint. Depending on the type of electrode you use, the current produced will be dependent on the voltage between these points. The total current can range from one volt to over forty volts.
There are different electrode types available for welding; the most commonly used are titanium, beryllium, copper, lead, cobalt and nickel alloys. When welding, the welding electrodes are placed on the work-piece and secured in place with clamps or welding rods. The electrode units are then connected to the conductors with welding wires. Most spot welding machines have an automatic welding control which makes the process much simpler, faster and safer than using manual techniques. It also allows for a more precise blending of the materials.
The most popular spot welding machines are used in the automobile industry to manufacture seat belts, door panels and a wide range of other parts. Many of these units come in the shop form and have a variety of different controls. These units generally hold a smaller number of electrodes. This type of welding unit generally produces a much faster weld time than other types of welders and offers users a better weld quality. When the weld time is reduced, it enables the welder to complete more repeatable and long-lasting jobs. It also improves productivity and efficiency in the automobile industry.
A spot welding machine includes the tongs and electrodes. The tongs allow the welder to apply heat to the different metals while holding them in place. The tongs must fit comfortably into the hand and should not slip or become stuck in any way. Most tongs that come with a spot machine have metal prongs on the end which allows them to hold the metals securely. The metal prongs also ensure that the metal is held in place in the correct position. The tongs and electrodes are secured in the machine by clamping the handles together and clamps around the body of the machine.
Some electric spot welders may not contain all the accessories that a typical power welder would, such as brushes and converters. Electric welders are typically less expensive to purchase and run more efficiently and therefore cost less money to operate. If the welder is to be used for applications requiring higher productivity and greater accuracy, then it is highly recommended that an electric welder be purchased. Some welders are equipped with universal joint connectors, which allow the welder to connect two or more metals which may be different densities and temperaments.