Spot Welding Machine – Principle, Types, Advantages

Spot welding machine is a machine used for metal connection, which is relatively common in metal processing. With the progress of welding technology and the improvement of welding requirements, welding equipment is more and more diversified, spot welding machine is a kind of welding equipment with a long history, so far in the industry also plays a very important role. This article will explain the spot welding machine in detail, take you to understand its principle, types, advantages, etc.

Principle of spot welding machine

Spot welding machine is a kind of resistance welding machine, this welding equipment is the use of current through the electrode and metal workpiece to generate resistance heat to provide heat source, through the way of heating and pressurizing the two metal contact is connected together. The electrode clamps two overlapping metal workpieces, this action is achieved by applying pressure through air pressure, the size of the pressure of the clamping workpiece mainly depends on the thickness of the material and the hardness of the material, the greater the thickness, the greater the required pressure value, the greater the hardness of the material, the greater the required pressure. When you are welding a new product with a spot welder, you can gradually adjust the pressure from small to large, during which the welded product is tested. Until you weld the product solder joint surface smooth, and the firmness to meet the requirements, this time the pressure value is the most appropriate.

 

In addition to welding pressure, welding current, welding time, contact resistance is also an important parameter of spot welding machine work, all affect the welding heat, the parameters complement each other, set the appropriate welding parameters in order to finally weld qualified products.

Type of spot welder

Due to the different working forms, we have divided the spot welding machine into 2 categories, Standard spot welding machine and customized spot welding machine.

Standard spot welder

Bench type spot welder

Benchtop spot welding machine is generally relatively small power, more suitable for welding small metal products, such as electronic parts. This spot welding machine body is small, easy to move, generally placed on the workbench or table to use, the operator can sit to complete the welding work.

Stationary spot welder

The fuselage is large and heavy, the machine is not easy to move, and it is generally fixed in a certain position in the factory, so it is called a stationary spot welder. Compared with the desktop spot welding machine, the stationary spot welding machine is generally large power, more powerful welding capacity, and generally welding metal parts with larger thickness. For instance, it can be used for the casing of led poster, car nuts, spot welding of aluminum plates, etc. For safety reasons, foot switches are installed, and the operator can also pick up and release the work by hand.

Portable spot welding gun

Also called suspended spot welder, because it is generally suspended to operate. The body of the portable spot welding machine is small, can be moved 360 degrees, generally used for welding is not easy to move or beyond the scope of large welding machine welding products, such as body welding will often use this equipment. You can adjust the height to the right position, align the part that needs to be welded, hold the handle switch, and you can complete a welding job.

Automatic special spot welding machine

Multi-head spot welder

In addition to the above standard spot welding equipment, you can also customize a welding machine specifically for your product according to your product and welding requirements. For example, if you want to weld a sheet metal of relatively large size, the use of standard spot welding machine is not convenient to operate and the welding speed is slow. You can ask the manufacturer to design you a multi-head semi-automatic spot welder, which can weld multiple points at once, thereby improving welding efficiency. This spot welding machine is often used for the welding of sheet metal boxes, and the equipment cost is higher than the standard machine because it needs to be customized according to demand.

X Y axis spot welding machine

In semi-automatic spot welding, the technology often used is X Y axis moving feed. In simple terms, this machine is a standard spot welding machine with an X-y axis moving table, the table is designed according to the size of the workpiece. In the welding work, the operator only needs to put the workpiece on the workbench fixed, the pneumatic switch button, the machine will automatically send the parts to the welding position, accurate positioning, and then start welding. This machine is often used for welding metal frames, sheet metal and wire mesh.

If you feel that the standard machine can not meet your welding requirements, and want to improve the efficiency and speed up, you can consider customized special spot welding machine. Just send your metal parts to spot welding machine manufacturers like Agera, we will discuss the welding process and requirements with you, and customize the welding scheme according to your requirements, and design a spot welder machine that is exclusive to you.

How to choose the right spot welder

Which type of spot welder to choose depends on the product you want to weld, followed by your welding requirements.

First of all, you need to determine whether your product can be welded through spot welding technology, strange shape or large parts are not suitable for spot welding equipment, you can consult the spot welding machine manufacturer whether you can weld, you can also take the parts to the spot welding machine manufacturer for sample.

If you determine that your product can be welded with a spot welder, the next step is to determine the model of the welder. At this time, it is necessary to look at the material, thickness and size of the product, the thicker parts need to use high-power spot welder, and the parts with large frames that are not good to move choose a mobile spot welder. You can also propose some ideas to customize a spot welding device with automation.

Advantages of spot welder

Welding speed is fast. Compared with other welding equipment such as laser welding machine, spot welding machine welding speed is very fast, a point welding time can be completed in one second, and even multiple points can be welded at the same time, greatly improving the welding efficiency.

Small welding marks. As long as you adjust the appropriate parameters, the welded product is beautiful, small deformation, no burrs, generally do not need to do processing after welding, saving a processing process.

No need to fill solder. The spot welder only needs to align the two pieces of metal to be welded, and it can be welded without adding any solder. Other welding methods are similar to arc welding, it is necessary to add solder in the welding process to weld, this way welding speed is slow, and the technical requirements of the welder are high.

Simple operation. The operation of the spot welding machine is very simple, only need to adjust the welding parameters before welding, you can start large-scale welding, this welding work can be completed by ordinary workers.

Application of spot welding machine

Welding material

Spot welding machine is used for welding metal materials, often used for welding stainless steel, low carbon steel, galvanized steel, copper, aluminum and other materials, in addition to the welding of the same material, can also connect dissimilar metals. In addition to the sheet metal welding, the joint projection welding of nuts, bolts and sheets can also use spot welders.

Industry application

Spot welding machine is widely used in the industry, and metal processing can often see its figure. Spot welding machine is mainly used in automobile manufacturing, electronic and electrical, household appliances, sheet metal cabinets, machinery manufacturing and other industries. Whenever you need a metal connection, you will most likely use a spot welder.

Summery

The above is a brief introduction to the spot welding machine, if you are looking for a suitable spot welding machine, this article should be able to get the answer. Choosing a suitable spot welding machine is very important, a good spot welding machine can create a more competitive product for you, a bad machine will reduce your work efficiency. You can also contact Agera  spot welding machine manufacturers, we will recommend the right model for you.