The CRUXWELD ProSpot 3500 is a 35 kVA pedestal pneumatic spot and projection welding machine for production shops. A pneumatic cylinder puts the same electrode force on every weld, a microcomputer controller times every stage of the cycle, and water-cooled arms keep it welding all shift. Flat, pointed and projection electrodes swap in minutes, so sheet, wire mesh, nuts and bolts all run on the one machine.
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Resistance spot welding joins two sheets with pressure and current alone. The electrodes clamp the sheets, a high current flows through the small contact area for a few cycles, the metal melts into a nugget, and the force is held until it freezes. On a pedal machine the operator supplies the force and the timing; on the ProSpot 3500 the cylinder and the controller do both, so every weld on the shift looks like the first.
Our technical team runs the ProSpot 3500 through sheet, mesh and nut welding, swaps the electrodes and walks through the controller settings.
The transformer sits in the steel column; the arms, cylinder, air tank, filter-regulator-lubricator unit and controller are all mounted on it. Connect power, water and the drain line, and it is ready to run.
A pneumatic cylinder on the upper arm brings the electrode down with the same force every time, up to 6200 N. Nugget size stops depending on who is on the pedal, which is what makes spot welds repeatable enough for inspection.
Seventeen parameters cover pre-pressing, squeeze, pre-heat, slope up, weld, slope down, temper and hold, all counted in mains cycles. Sixteen schedules are stored, a counter logs the welds, and a fault code tells you why it stopped.
Standard 25 mm holders take pointed tips for sheet, flat bars for wire and mesh, and die sets for nuts and bolts. Changing over is a matter of loosening the holder clamps.
Cooling water runs through both electrode holders and arms at 3.5 litres a minute or more. Tips stay hard, the transformer stays cool and the machine keeps its rating through a full shift of repeat welds.
The air tank on top of the column stores compressed air for the cylinder, so pressure is steady from one weld to the next even on fast repeat work. A drain valve under the tank takes the condensate out.
The filter-regulator-lubricator on the arm housing cleans the air, sets the working pressure (0.5 MPa input) and mists oil into the cylinder. The gauge on it is where electrode force is dialled in.
16,000 A maximum welding current, 15 kA short-circuit.
Mild steel sheet, two layers, in one spot.
Maximum electrode force from the pneumatic cylinder.
Arms and holders, 3.5 L/min or more, insulation class H.
The arm and holder geometry stays the same; only the copper at the tip changes. That is why one ProSpot 3500 covers sheet-metal, wire products and fastener welding in the same shop.
Standard spot welding of two sheets up to 3 mm each: enclosures, brackets, panels, ducting. The pointed tip concentrates current into one nugget.
Broad flat bars spread the force over crossing wires, so several wires can be welded in one press. Mesh panels, baskets, grills and trays.
The projections on a weld nut carry the current, so a flat die welds the nut to the sheet in one shot without marking the show face. Needs a die set for the fastener.
Two displays: the top one shows welding current or voltage, the lower pair shows the parameter number and its value. Press the pedal in Work mode and the stored schedule runs; switch to Set mode to edit it.
Front, pointed tips
Controller on the column
Flat electrodes fitted
F.R.L. unit and copper shunt
Flat bars on wire mesh
Loading weld nuts
Several wires in one press
Sheet brackets, panels and trays
Mesh and perforated sheet
Wire grills and basketsThe ProSpot 3500 is the production machine; these cover the lighter, the hanging and the seam jobs, and the cooling water it needs.
Send a photo or drawing of the job, the sheet thickness or wire size, and your city. Our technical team replies on WhatsApp with the electrode set-up, price and delivery.
Pneumatic spot and projection welder, 35 kVA
Welding capability is quoted for two sheets of mild steel. Stainless, coated and dissimilar sheets, and projection welding of fasteners, are confirmed on sample parts by our technical team. Specifications as published by CRUXWELD.
Pointed and flat tips, 25 mm holders, copper alloy.
Filter-regulator-lubricator; laminated copper shunt.
Replacement microcomputer resistance controller.
The CRUXWELD ProSpot 3500 is a 35 kVA pedestal-type pneumatic spot and projection welding machine built for repetitive fabrication work. It welds two sheets of mild steel up to 3 mm each with a maximum welding current of 16,000 A, and its pneumatic cylinder applies up to 6200 N of electrode force on every weld. Because the force comes from the cylinder and the timing from the controller, each spot is made the same way whoever is on the pedal.
A microcomputer resistance weld controller sets the whole cycle in mains cycles: pre-pressing, squeeze, pre-heat, slow rise, weld, slow fall, temper, hold and off. Sixteen schedules are stored, so a shop running several parts switches by number instead of re-entering values. Constant-current control holds the welding current steady as the arms warm up, a counter tallies the welds, and eight fault codes stop the machine and tell the operator what went wrong.
The 50 mm arms carry 25 mm electrode holders that take pointed tips for sheet, flat bars for wire and mesh, and die sets for projection welding nuts and bolts. Changeover is quick, which is why the same machine serves sheet-metal enclosures, wire baskets and fastener welding in a general fabrication shop. Water-cooled holders and arms, fed at 3.5 litres a minute or more, keep the machine at its rating through a full shift.
An air tank with an inbuilt compressor sits on top of the column, feeding the cylinder through a solenoid valve and an F.R.L. unit that filters the air, sets the working pressure and lubricates the cylinder. A foot pedal starts each weld, and single or repeat mode is chosen on the panel. The machine measures 940 × 640 × 1560 mm, weighs 350 kg and has lifting eyes for installation.
The ProSpot 3500 sits in the Resistance Welding range beside the ROKR 16K pedal-operated spot welder, the DuoFlex 20K spot and seam welder and the AeroSpot 35 hanging spot welder. Our technical team sets up electrodes and schedules for your parts on WhatsApp and video call.
