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BU-1 Fine Gauge Copper Brazer for Magnet Wire & Stranded Conductor Joining

Achieve clean, repeatable joints on fine-gauge copper with the Model BU-1 Silver Solder Brazer from Micro Products Company. Built for joining solid copper from 28 to 16 AWG and stranded copper from 26 to 16 AWG, the BU-1 brings precision to fine-gauge conductor joining. Loading is straightforward: seat both conductor ends in the alignment dies, drop in a silver solder chip, and the machine handles the braze. A super-sensitive ball-bearing headpiece and spring-loaded clamp fingers hold everything in true alignment, while the step-less VARIAC voltage regulator, analog level indicator, and selectable timer let you dial in exactly the right heat. Available as a compact 70-pound bench unit or on a mobile truck, the BU-1 adapts to whatever your workspace demands.

  • 110 volts, 60 cycle, single phase
  • Adjustable heat control with analog level indicator
  • Manual or timer controlled brazing (selectable)
  • Spring loaded clamp fingers
  • Mounted lamp and squaring shear
  • Bench mount
Metal:
Brass, Bronze, Copper, Nickel
Construction:
Solid, Stranded
Solid Copper Welding Range:
28 AWG (0,321 mm) - 16 AWG (1,291 mm)
Stranded Copper Welding Range:
26 AWG (0,129 mm) - 16 AWG (1,31 mm)
Max Current Draw:
16
Single Phase Transformer:
Yes
Heat Selection Method:
VARIAC
Upset Method:
Mechanical
Air Requirements:
n/a
Mounting Truck Type:
Bench Mount or 4 Wheels
Dimensions & Weight:
Welding Die Height: Bench: 18 in (45.72 cm) Trucj: 46 in (116.84 cm)
Width Across the Front: Bench: 11 in (27.94 cm) Truck: 24 in (60.96 cm)
Depth to the Back: Bench: 18 in (45.72 cm) Truck: 24 in (60.96 cm)
Height: Bench: 29 in (73.66 cm) Truck: 57 in (144.78 cm)
Weight: Bench: 70 lbs (31.75 kg) Truck: 120 lbs (54.42 kg)
  • Post Type Truck
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Butt Welder Upgrades to Improve Your Precision and Productivity

Upgrade your Micro Weld butt welders with world-class safety & technology accessories. You’ll get the same quality, rugged welders with the safety features you need, creating uniformity with every machine and consistency with every training.

  • New Finger Safe Covers & Components
  • 24V Control Circuit
  • Interlock Switch on Rear Access Panel
  • Solid-State Heat Control
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Applications

Maintaining continuous coil supply in motor winding and coil manufacturing by splicing fine-gauge stranded copper from 26 AWG to 16 AWG without scrapping partial runs

Keeping magnet wire drawing and respooling lines moving with clean, aligned solid copper joints from 28 AWG to 16 AWG

Producing precise silver-solder joints on thin copper conductor where resistance welding would damage or distort the wire

Reconnecting fine-gauge wire on winding equipment and transformer production lines before a partial coil becomes scrap

Bench-top brazing of small copper, brass, bronze, and nickel conductor in electronics assembly and precision wire fabrication environments

Real-World Benefits

  • Silver solder brazing rather than fusion welding provides controlled, low-heat joining of fine-gauge wire — well suited to conductors that face tight bends, high-speed winding, or electrical testing downstream.
  • Spring-loaded clamp fingers and a ball-bearing headpiece hold both wire ends in precise alignment before and during the braze for consistent, well-centered joints on thin stock.
  • Step-less Variac heat control with an analog level indicator gives operators fine-grained heat adjustment for different wire gauges and alloys — reducing the scorched or undersized joints common with fixed-heat equipment.
  • Selectable manual or timer-controlled brazing mode lets operators choose free-form control for mixed work or locked repeatability for production runs.
  • At 70 lbs on a bench mount or 120 lbs on an optional truck, the BU-1 fits into any wire shop, winding room, or assembly area without dedicated floor space or special installation.

Comparison to Similar Models

The BU-1 occupies a distinct category within the Micro Weld range — it is a precision silver solder brazer for fine-gauge copper, not a resistance butt welder. For wire from 28 AWG to 16 AWG where alignment and controlled heat are the priorities, the BU-1 is the purpose-built solution. Operations working with heavier stranded copper conductor, or requiring fusion welding rather than brazing, should look to the AD Series starting with the AD-3.1. The BU-2 handles a heavier gauge range for applications that have outgrown the BU-1’s capacity.

Best For

Motor winding operations, magnet wire producers, and fine wire fabricators joining solid and stranded copper from 28 AWG to 16 AWG — shops where precise alignment, controlled brazing heat, and a compact bench-mount footprint matter more than high-energy output.