Spot Welding Machine

Following Companies Manufacturing Welding Machines Machine (46 Companies)

1. The amount of current that passes through the work.
2. The pressure that the electrodes transfer to the workpiece.
3. The amount of time that an electric current enters.

1. Flash Welding
2. High frequency
3. Percussion welding
4. Projection welding
5. Resistance seam welding
6. Resistance spot welding
7. Upset welding

• Resistance
• thermal conductivity
• melting point

1. Welding speed is less than one second and is suitable for industries such as transportation and automotive.
2. For sheets less than 0.25 inches thick, it performs very well.
3. No need to use fillers and consumables.
4. In this process, the voltage consumption is low, which will cause security in the process.
5. The welding process is clean and free of contamination.
6. The connection formed is reliable.
7. This process can be robotically controlled and executed.

1. Fatigue and low tensile strength
2. It is not tolerable
3. High wear on the electrode
4. Its equipment is more expensive than other electric arc atmosphere processes
5. If the capacity of the power lines does not match the ability of the machine, it can cause many problems.
6. The welds created by the resistance welding process are not capable of non-destructive testing.
7. They have low tensile strength.

1. electrical circuit:

Includes step-down transformers, switches and secondary circuits

2. Control circuit:

It is a circuit that controls the flow time and current intensity. In other words, if this circuit does not exist, the cut-off time may exceed the allowable limit, and instead of two metal plates being welded to each other, they will melt at the same point and no welding will take place.

3. Mechanical system:

Includes machine frame, clamps (fixtures), copper electrodes, pneumatic pressure inlet jack and pliers (jaws)

4. Electric current generation system:

Converters are considered as the manufacturer of high amp current system for welder.

• The electrodes used in welding are closer to the metal surface. At this stage, pressure and force are applied to the surface.
• Electric current connects to metal parts through copper electrodes, causing them to melt.
• The electric current is cut off, but the electrodes between which the sheet is placed continue to push. This pressure lasts for one or two seconds as the molten and cooled area cools and solidifies. The important point here is that the duration of the electric current varies. This period depends on the thickness of the metal, the pressure of the electrodes, the diameter and cross section of the electrodes, and the amount of current passing through.

• Do not spray welding
• It is cost-effective due to the lack of filler use and high power consumption
• High boiling speed
• Clean welding without welding waste
• Ability to automate it
• No need for a skilled operator
• Possibility of welding sheets with relatively different materials
• Low vapors without too much smoke
• Easy maintenance

1. Usable electrodes must have access to both sides of metal parts
2. These welds are only suitable for thicknesses up to 3 mm
3. Inability to move the electrodes in any direction
4. The size and shape of the electrode must sometimes change with the material
5. The welding connection takes place only at the point where the electrode is concentrated and it is not possible to weld or move the electrode.
6. If the electrical current of the machine is low, the parts will not be welded together properly
7. If the pressure between the two jaws is not enough, the parts will not be welded together properly.
8. The appearance of welding is not relatively beautiful.
9. For welding with zinc plating or alloy, the electrodes must be shaved or cleaned.
10. Electrodes with high electrical resistance are used to weld copper parts.
11. Generally it is not recommended for welding zinc alloys or zinc coated or aluminum.

1. If the material of two pieces are sheet steel or steel with low carbon content, the weld will not have high strength.
2. For welding two pieces made of galvanized steel coated with zinc, we have to use more current. On the other hand, if the steel material is uncoated, less current is required.
3. Zinc alloys reduce the quality of resistance welding.
4. If we want to weld two metals or two sheets made of aluminum to each other through resistance welding, the head of the electrode, which is made of copper, must be replaced with the head of the electrode, which is made of nickel and titanium alloy, because the point Aluminum welding is low. Aluminum wears the surface of copper electrodes easily and quickly. The fact is that welding aluminum through resistance welding will not be an easy task and requires special experience and knowledge.
5. Copper and copper alloys can be joined by spot welding. But any welding of copper and its alloys is difficult to do because the material of the electrodes is the same as the material of the part we want to weld. For this purpose, for resistance welding of copper, electrodes can be used that have high electrical resistance and their melting temperature is higher than copper. For example, you can use molybdenum and tungsten electrodes whose temperature is more than 1080 degrees Celsius.

• High speed in welding
• Very durable and strong against spot soldering and welding
• Cheap and affordable
• Welding process No splashing and its cleanliness
• Fast fixed and non-consumable electrodes No need for filler-No need for shielding gas
• No steam and smoke
• Possibility of automation and connection to robots and CNC
• Possibility of single use and cases and several welds together

1. One of the limitations is the instability of this type of weld compared to other welds such as CO2 welding
2. They are not suitable for welds whose parts have a complex shape or irregular curves, or the inner and outer corners and angles of the parts cannot be welded.
3. Cannot be used for metal sheets with a thickness of more than 3 mm
4. It is not possible to do butt welding

Characteristics of roller electrodes (disc)

1. It has good strength and stiffness and does not break or bend due to pressure
2. Have high temperature resistance
3. Have a suitable electrical conductivity
4. Have a high thermal conductivity

1. First, consider the variety of your products in terms of material, dimensions, and thickness
2. Examine the working environment of the machine. Humidity, dust, improper temperature, and incorrect location can impair the performance of the resistance welding machine and increase the rate of wear.
3. Depending on the type of activity, production rate, and process you are considering, consider the type of resistance welding machine and search for suitable companies and send the necessary information to them.
4. Compare and match the amount of budget you have planned for purchasing the machine with the type of resistance welding machine you consider for your work process. Because some resistance welding machines with smaller dimensions and less energy consumption can meet your needs and you do not need to buy complex machines.
5. Specify the number of working days per week, the number of working shifts per day, and the number of hours per shift for the manufacturer of resistance welding machines.
6. Improper selection of a resistance welding machine can cause the part to disintegrate, melt and deform the weld area.
7. When ordering a resistance welding machine, make sure that there is a cooling system.
8. Consider the minimum and maximum current output provided by the resistance welding machine.
9. Some resistance welding machines can weld almost all metals, but it is important to consider whether such a machine can meet your work needs or not. If your work needs are less than the capacity of the machine, the cost you spend on it will not be economical.
10. Request the necessary technical specifications from the manufacturer of resistance welding machines along with a guide for selecting the appropriate current rate.
11. A variety of different tools (electrodes, etc.) and multifunction can offer you to create welds with different characteristics.
12. Some resistance welding machines have the ability to move the welding jaws horizontally.
13. Determine the throat depth of the machine in proportion to the activity and dimensions of the work.
14. The amount of pressure applied by the electrodes to the part can be controlled and determined in three ways: hydraulic, pneumatic, and mechanical.
15. Side electrode holder can be requested from the manufacturer of the resistance welding machine. The side electrode holder allows the electrodes to be replaced in the shortest possible time.
16. In some welding point machines, several electrodes can be used simultaneously with different currents for different parts and in sequence. High production rate and simultaneous welding of several different types of metals are the advantages of such welding machines.
17. More time can be spent on the use of resistance seam welding machines. Because welding machines have the ability to perform welding operations in consecutive cycles and for longer. The amount of output current depends on the type of part, thickness, welding speed, and step (distance) between two welds.
18. The resistance spot welding machine often easily welds thicknesses between 0.5 mm and 3 mm.
19. The portability or stability of the machine is one of the points that can be checked according to your needs.
20. Whether the machine is single-phase or three-phase will be checked depending on the amount of current required.
21. The presence or absence of a workbench with a resistance welding machine can be checked according to your wishes and needs.
22. If you need an automatic resistance welding process, you can use a robotic system to create various and accurate welds.
23. The choice of the type of robot and its brand will be determined depending on the type and complexity of the work. When buying a robot, be sure to pay attention to the degree of freedom and ability of the machine.
24. Attention in choosing the right PLC and in accordance with the work system is very important for ease of programming and working with it.
25. To use robotic resistance welding, resistance welding machines that can be mounted and adapted to the robotic system must be used.
26. Resistance welding is very suitable for galvanized steels, titanium, stainless steel, low carbon steel, and copper.
27. Resistance welding machines can weld cold rolled sheets, wire fences, and steel sheets well.
28. In spot welding, all-carbon and high-carbon steel are hard to weld and prone to cracking, but low-carbon steels are easily welded.
29. For welding aluminum with resistance welding machines, two points must be considered: first, the surface of the part must be very clean and free of any oxides and dirt, and second, that precise regulation of the output current is important to prevent melting and spillage of aluminum.
30. If there is a need to weld sensitive alloys such as gold, silver, and platinum, the manufacturer of the resistance welding machine should be notified.
31. It is better to send the technical information and brand of high-consumption parts, wires, hydraulic and pneumatic pipes and cylinders, workers, rails, brand and model of electric motors, bearings, keyboards, etc. to the manufacturer.
32. Ask the manufacturer of the electrical circuit of the machine, the hydraulic circuit, the list of parts, the connection of the cables, the maintenance manual of the machine and its predicted errors.
33. Enter the necessary agreements regarding after-sales services such as transportation, installation, training, replacement and repair warranty, etc. by the manufacturer in writing and have them signed by both parties.
34. Consider safety tips in the construction and use of resistance welding machines.