Spot and projection welders

Spot and projection welders are designed for both spot and hump welding work. All ASPA brand welding machines also have a robust frame-based design and fully meet an extremely wide range of the heaviest industrial applications in mass production. They can be equipped with special controls in various configurations upon request.

Spot and projection welders are used for resistance spot welding of sheet metal or welding nuts or other small parts to sheet metal, as well as for projection welding of workpieces. They are mainly dedicated to working with steel parts (both construction steel and stainless steel), but we are able to individually select the machine and its accessories for other materials as well, depending on the customer’s specific needs. The range of welded sheets that we have implemented in our series machines is from 0.2 to 6 mm thick.

Unlike smaller spot welders , these are machines with a more rigid structure, designed for welding thicker sheets and larger parts. The versatile design allows a wide range of applications with only minor modifications to the welding tools.

These welding machines are equipped with a whole range of welding controllers, which we produce in-house at ASPA, and which we select individually according to the customer’s requirements and needs (e.g.: controllers with the possibility of recording process parameters, quality control, electrode wear compensation, etc.), electrodes adapted to the applications possessed by the customer, and pneumatic clamping.

MFDC medium-frequency technology (“i” marked welders)

The MFDC range of medium frequency inverter resistance welding machines is the best answer to the growing demand for quality in resistance welding applications. Constant current control, fast millisecond current control, high quality and excellent control of energy transferred to the weld nucleus are the main advantages over traditional 50 Hz units. MF models fully meet the toughest industrial applications in mass production. Their characteristics make them ideal for spot resistance welding of small thicknesses and hard-to-weld materials such as copper, brass, aluminum alloys, galvanized and other coated steel.

Advantages of MFDC 1000Hz medium frequency inverter technology

• Ability to make high-quality connections on materials that are difficult to weld
• Excellent properties when welding pure aluminum or its weldable alloys, copper and brass
• Ability to reduce welding time to a few milliseconds, leading to savings in welding time and increased electrode life
• Fast ramp-up to the set welding current
• High efficiency and power factor
• Symmetrical load on three phases of the network
• Lower energy costs by reducing power consumption from the mains supply
• Energy is converted mainly in the weld nucleus
• Less heat loss through the workpiece and electrodes
• Indirect quality control of the weld nucleus
• Ability to modify the current waveform with dedicated inverter controls
• Reduced effect of magnetic field influence on magnetic materials