When you hear the word Welding and you think of a hot metal arc shooting out of a machine, one of the common images that comes to mind is a traditional work shop with a huge open space and several workers welding on large pieces of metals. In modern industrial welding, however, we use a very different kind of machine called the Suspended Spot Welding Machine. A typical Suspended Spot Welding Machine (often abbreviated as SPW) can be found in smaller shops and for home use as well. This article will explain how it works and why it’s better than other kinds of welding.
The basic difference between stand mounted and an automated suspended welding machine is in the area of the torch or arc. Stand mounted welders weld by placing a heavy welding rod directly into an inert gas, often tungsten, and a shielding of various types of powdered metal is placed over the rod. This shielding prevents the metal from getting too hot while the arc is being conducted, and the welding is controlled automatically by means of an electronic control device.
With an automated suspended spot welding controller the torch is continuously controlled via the welding gun. If you’re using a gas-fueled gun, the gun is connected to a supply of gas or to your computer via a wire or data cable that runs through the work area and also keeps tabs on the current welding current. When the gun is turned on and the shielding is in place, the gas shielding will provide enough shielding to stop the arc, but the current will still be controlled by the computer. It will continue to arc until the welding current is too low to continue, causing the weld to fizzle.
This is similar to the automatic torch but instead of automatically controlling the arc, a user can program the exact setting of the welding torches used. The only difference is that this setup is a little more difficult because you have to manually control the angle of the torches in order to prevent a fizzle. Another downside is that these welding torches are usually not as powerful as the gas-fueled welders and thus use a lower current when compared with the electric welders. Still, they do have their place in many situations.
In order to use the gas-fueled spot welding gun without the need for manual control, one would have to mount the gun in a way that allows them to continuously control the flow of gas and current through the welding torches. This is most commonly done using an adjustable mounting clamp. Some people prefer this method because it enables them to perform a continuous arc welding without needing to actually use the hand-held torch for most of the work. The disadvantage to this method is that using a regular stick to control the current is difficult because many metals won’t flow evenly flow with evenness of heat distribution. Also, the clamp is necessary to prevent the torch from inadvertently touching any of the metal parts it is welding.
The last type of welding machine commonly used by welders is the continuous feed welders. Unlike the suspended types, continuous feed welders need the welder to continuously control the speed at which the filler wire is fed through the weld gun. Because of this, a welder must be comfortable with monitoring the temperature of a weld at all times during a weld. A weld without consistent heat distribution can easily forge the wrong shape, which leads to imperfect welds and frequent fatigue. Another flaw that continuous feed welders often produce is uneven welds.