What to Consider When Purchasing a Spot Welding Machine
A spot welding machine is often referred to as a thermal resistance welder. The welding machine is used in a variety of metalworking environments to weld two or more pieces of metal together. Welding in this process is done using an arc, which is actually a high-speed electric arc, and is not done with the aid of tungsten inert gas, which has both its advantages and disadvantages when welding. Welding can also be done through the use of tig welding, gas tungsten arc welding or press metal arc welding. Spot welding machines are available in many different sizes depending upon the type of work to be performed. There are also different types of welders that are used for welding, such as wire welders, mig welders, stick welders.
When purchasing a spot welding machine, there are some important things to consider to make sure you choose the best one for your specific welding project. The most important consideration will be the material to be welded and the appropriate heat level to be used. Other factors to keep in mind will include the type of welding required, the operating temperature, the type of feed rate, the welder’s skill, the electrode material and the electrode size. Some welders will accept various types of welding fuel, while others use only one particular type of fuel. Many welders will also feature varying line pressure and Tg (total heat release) rates to control the temperature at which the weld is completed.
If your application requires a much higher wattage of welding, then you will want to purchase a power supply that offers an automatic boost function for increased power. The power supply may also have an adjustable Duty Set that controls the amperage and volts that are supplied to the electrodes. The duty set should be appropriate for the specific application and the specific wire size being used. There should also be an option for a variable pulse setting on the power supply to allow for a precise and controlled amperage and maximum possible wattage.
You also want to consider the different options for the heat treatment of the final weld. This will affect both the amperage and voltage of the welding process. The most common method used is a ‘contact heat’, which involves applying a constant amount of heat to the spot and then removing it after the welding is complete. This maintains a consistent and even temperature throughout the entire run of the machine. A ‘thermal’ or ‘hot’ wire is also available for use in spot welding machines and is a commonly used method that maintains consistent heating temperatures throughout the entire weld.
The overall weld time is an important factor to consider when purchasing a spot welding machine. If you expect to be working on small areas or low gauge metals, you will not need to have a very long weld time. Conversely, if you expect to work on thicker metals, you will want a longer weld time. There are many factors involved in determining the appropriate weld time; these factors include the current heat input, metal thickness, and the machine capacity. Some machines will run better when using a lower amperage than others, while others may require more metal to be heated.
There are many other variables to consider when purchasing a spot welding machine. These variables should all be included in your research and design. The cost of the welding equipment, parts and consumables, as well as the final cost of the project will be included in your final budget. Finally, you will want to ensure the machine has the appropriate power and the appropriate amperage for the job you are attempting to complete.