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UB-4000A Linear DC Spot Welder

UB-4000A Linear DC Spot Welder

  • Category:Linear DC Welders
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  • Publication Time:2026-06-25
  • Product Details

UB-4000A Linear DC Spot Welder

Formerly known as DC29. Replaces DC25.*

The UB-4000A linear DC resistance welding control is a 200-4000 amp linear DC control with four feedback modes designed to adapt to part and process variables. Weld energy may be programmed in current, voltage, power, or V-A, in increments as short as .01 milliseconds making this spot welder ideal for small applications in the electronic component and battery pack markets.


A successor to model DC25, and built in the USA, the UB-4000A features a variety of updates, including greatly improved waveform control and faster rise time, as well as new side-mounted buss bars with threaded inserts for mounting weld cables, simplified rear panel I/O connections, and an on/off switch on the front for increased convenience.


Four control modes: current, voltage, power and V-A (voltage-current)

Single phase input

Compact size

Dual pulse schedules

Precisely controlled repeatable waveform

Very fast rise time

*UB-4000A replaces the DC25 in the majority of applications, please consult AMADA WELD TECH for suitability of replacement prior to purchase.



Technical Specifications

Technology Linear DC

Output Range Amps: 200 - 4000

Volts: 10

kW: 25.0

Weld Period Range (ms) A: 0 - 99 B: 0 - 999

Output Control Mode Current, voltage, power, combo

Open/ Closed Loop Closed

Built in Monitor Yes

Automation Ready Yes

Input Power 88 - 264 VAC

Single or 3 phase Single

Size (W x D x H) 8.4 in x 15 in x 12 in (213 mm x 381 mm x 305 mm)

Weight 49 lb (22 kg)

UB-Series-Technical-Datasheet.pdf

990-919T-UB500A-4000A-Users-Manual.pdf