PRODUCT
SB-1250 Insulation Pin Welding Machine - Cup Head Pin Welder
The IKING SB-1250 is a portable capacitor discharge (CD) insulation pin welding machine designed for fast, one-trigger fixing of cup head pins and CD studs on HVAC ductwork. Powered by a 189,000 µF capacitor bank delivering up to 1250J of welding energy, it achieves high-speed cycles up to 40 pins/min.
Key Features & Specifications:
• Energy & Capacity: 1250 J output | 189,000 µF capacitor bank
• Voltage Adjustment: 35–95 V digital precision control for 0.6–6mm sheet metal
• Welding Speed: Up to 40 pins/min continuous sequence
• Lightweight & Portable: 18 kg compact design with ergonomic carry handle
• Clean Surface Finish: Single-side welding leaves the reverse face unmarked & rust-free
• Standard Compliance: CE & ISO 9001 certified | IP23 protection class
• Applications: HVAC duct wrap, glass wool/rock wool insulation, pipe & tank insulation
Package includes: SB-1250 power unit, contact pin welding gun with lead, earth clamp, and spare copper nozzles. Factory-direct supply with mixed-pin order support.
The SB-1250 insulation pin welding machine is a hand-carried capacitor discharge unit. It charges a 189,000 µF capacitor bank to an adjustable 35–95 V and dumps that energy into a cup head pin in a few milliseconds, so the pin welds to galvanized sheet on one trigger pull. The machine weighs 18 kg, carries by its handle, and runs on a single phase 220 V supply. In this cup head pin welder the pin and the wrap are fixed in the same pass, which is what shortens duct lining work on site.
Product Overview
One trigger does the whole fixing. The disc of the cup head pin fuses to the galvanized face, the wrap is laid over the pin, and a self-locking washer bites the shank and holds the wrap down. No adhesive, no drilling, no bracket on the far side of the sheet. The SB-1250 insulation pin welding machine puts the full 1250 J into that disc through a contact gun, so the arc stays inside the pin root and the reverse face of the sheet is left unmarked.
The gun seats the pin on the sheet and discharges. Nothing passes through the panel, so exposed spiral duct and thin casing keep a clean inner face.
The 35–95 V range covers 0.6 mm duct sheet up to heavier plate. Thin sheet takes a low setting, thicker steel takes more, and the dial is on the front panel.
The pin holds as soon as the gun lifts. There is no curing window, which is why a crew can wrap straight after the weld and keep moving along the duct.
How the Pin Is Welded
Dial the voltage for the sheet thickness and switch on. The display reads the charge as the bank fills.
The gun presses the pin against the sheet and fires once. The disc fuses in milliseconds and the light goes out.
Lay the glass wool, rock wool or closed-cell rubber over the pins, trim at the face, then press a washer onto each shank.
A paper washer sits at the pin root on the welding grade, so the arc is centred on the disc and the galvanized coating around the weld is not burned away. That is what keeps the joint from rusting in a plant room. The gun runs off the capacitor bank, not off a transformer tap, so the weld is the same on the first pin of the shift and the four hundredth. Rated sequence is up to 40 pins per minute on a charged bank.
Pins are supplied separately from the machine. Galvanized cup head pins, plain CD pins and round self-locking washers all run on the same unit, so one box of pins covers a wrap job and a liner job on the same site.
Front Panel and Connections
A three-digit voltmeter shows the charge level. The plus and minus keys move the setting inside the 35–95 V window, and three indicator lamps sit beside the display.
The gun plugs into the left socket and the earth clamp into the red socket beside it. Both leads are part of the set, no separate adapter is needed.
18 kg with a moulded handle, so one operator moves the unit along the duct run instead of dragging a trolley through a plant room.
Specifications
| Item | SB-1250 |
|---|---|
| Welding energy | 1250 J |
| Capacitor bank | 189,000 µF |
| Charging voltage | 35–95 V, adjustable on the panel |
| Input | 220 V, 50/60 Hz, 20 A max, 10 A effective |
| Pin diameter | 2–6 mm |
| Protection class | IP23 |
| Insulation / cooling class | B / F |
| Standard | JB/T8323-96 |
| Dimensions | 430 × 220 × 310 mm |
| Weight | 18 kg |
| Marking | CE, ISO 9001 |
The bank is built from shock-mounted capacitors that never touch the housing, so a dropped machine does not short the battery. A separate cooling channel keeps dust off the inverter board and holds the cycle sequence steady through a long shift. If your sheet is outside the 0.6–6 mm range covered here, say so before ordering and we will check the setting instead of selling you a bigger unit.
What Ships With the Machine
• SB-1250 power unit with carrying handle
• Pin welding gun with hose and control lead
• Earth clamp and return cable
• Spare copper nozzles
• Operation booklet and rating plate on the housing
Where This Unit Is Used
Rectangular and spiral duct, glass wool or rock wool over the sheet, washers locking the wrap at the face.
Refrigeration and air purification lines, where the pin has to reach through the insulation layer onto the steel underneath.
Equipment housings where the back of the panel cannot be reached, so the fixing has to be welded from the outside only.
For bare liner inside a duct, the same machine runs plain CD weld pins; for fibrous wrap and lagging at seams it runs lacing anchors. On a duct run the cup head pin welder is dialled down for 0.6 mm sheet; on a tank shell the same unit is turned up and takes a 6 mm pin. Wraps and liner setups are listed under insulation pin welding solution, with pins under insulation pins and guns under accessories.
Why Buyers Choose IKING
The SB-1250 comes off the same plant in Tianjin as the cup head pins, CD weld pins and washers it runs on. A tolerance question on the pin side is answered by the people setting the machine side.
Energy, capacitance, voltage range, protection class and weight are stamped on the housing, not only printed in a catalogue. A buyer can compare the plate against the quotation before the crate is opened.
Consumable parts ship from stock, so a worn nozzle does not park the machine for a month.
Pins, washers and the gun can be priced on the same sheet, so landed cost is known before the order is placed.
Packing, MOQ and Lead Time
Each unit is packed in an export carton with the gun, cable and nozzles in the same box, then strapped onto a pallet for LCL or loaded straight into the container for FCL. Shipping cartons are marked with the model, quantity and MADE IN CHINA.
MOQ is one unit for the machine and one carton for the pins, so a first order can be a single set with a mixed pin carton. Standard machines leave the plant in 7–15 days; a 220 V / 50 Hz build for your market is the standard version, and other supply voltages are made to order.
Send the pin diameter, sheet thickness and destination port, and the machine setting, pin quantity, packing weight and shipping date come back the same working day.
FAQ
2–6 mm diameter, which covers standard cup head pins, plain CD weld pins and lacing anchors in the sizes we stock. Pin length is chosen by the insulation thickness, not by the machine.
No. The discharge is drawn into the pin root and stops at the sheet. The reverse face stays clean, which is the reason exposed spiral duct is wrapped with this method.
Up to 40 pins per minute on a charged bank is faster than one operator can wrap, and a cup head pin welder does not need a second man to hold it. Crews on larger jobs usually run two units so welding and wrapping do not wait on each other.
A single phase 220 V socket, 20 A service is enough. It pulls 10 A effective on a normal duty cycle, so a site socket and an extension rated for that current are all that is required.
Send the pin diameter, sheet thickness, quantity and destination port. We will come back with the machine setting, pin size, packing weight and lead time.
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