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RoMan Resistance Welding Transformers

T. J. Snow carries a full line of RoMan new and used resistance welding transformers to fit your application. RoMan designs and manufactures three types of water-cooled transformers – MFDC transformers, fixture type and machine type transformers. They are designed to meet any resistance welding application requirements—from small spot welds to large projection welds, and can be integrated with any brand of controls, weld-guns or robotic systems.

resistance welding transformers

MFDC / Inverter Type Transformers

RoMan’s MFDC transformer is compact, robust and ideal for robotic and projection/stud welded parts.

  • kVA Range: 40 – 1,000 kVA
  • Primary Volts: 325-800 Volts
  • Frequency Range: 400-2500 Hz
  • Standard models are listed below. Contact us for details about models and voltages not listed.
fixture type transformer

Fixture Type Transformer

The RoMan fixture type transformer is the perfect choice for multi-spot welding applications. This flexible, water-cooled transformer is easy to adapt to your specific application. Built to RWMA specifications, there are many options and configurations available.

  • KVA Range: 25 – 200 KVA
  • Voltage:
    • 240 Volts, 50 Hz
    • 480 Volts, 60 Hz
    • 575 Volts, 60 Hz
  • Options:
    • Secondary Parallel Bar Kit
    • Secondary Series Bar Kit
    • Grounding Reactor
machine type transformer

Machine Type Transformer

RoMan’s machine type transformer is used in a variety of applications such as spot, press, seam, rocker arm and more. This robust, water cooled transformer conforms to RWMA standards. The transformer connects to the welding tooling on the upper and lower knee by bus bars or laminated shunts.

  • KVA Range: 20 – 500 KVA
  • Standard Primary Voltages:
    • 240 Volts, 60 Hz
    • 480 Volts, 60 Hz
    • 575 Volts, 60 Hz

MFDC / Inverter Type Transformers

KVA Rating @50%Model #Primary Volts/HertzSecondary VoltsMetric/ImperialWeight lb/kgReplacesNormally In Stock 
40 TDC-1057340/12002.23-4.47I50  N
100TDC-5583650/10009M47.4/21.5

TDC-1042 ;

TDC-1064

Y
100 TDC-5618500/10009.1M47.4/21.5 N
100TDC-5748800/10009M47.4/21.5 N
160 TDC-5998650/10009.0-13.0M70/32TDC-5610 Y
160 TDC-5826500/10009.0-13.1M70/32  N
160 TDC-5999800/10009.0-13.1M70/32  N
160TDC-6650650/10009.0-13.0M70/32  N
160 TDC-6827800/10009.0-13.1M70/32  N
170 TDC-1070650/10009.5-13.0I45/100 Y
170 TDC-1078650/10009.5-13.0M45/100  N
170 TDC-5620800/10009.5-13.1M45/100  N
170TDC-6599325/10009.5-13.0M45/100  N
225TDC-7000650/100013M110/50  N
225 TDC-7080500/100013.1M110/50 N
320 TDC-5874500/10009.0-13.1M190/86  N
320 TDC-5876650/10009.0-13.0M190/86  Y
320 TDC-6128800/10009.1-13.1M190/86  N
320 TDC-7099500/10009.0-13.1M250/114  N
320TDC-7015650/10009.0-13.0M250/114  N
320TDC-7021800/10009.09-13.11M250/114  N
400 TDC-5447500/10009.0-13.1M435/198  N
400 TDC-5422650/10009.5-13.0M435/198  N
 
 
 

FIXTURE TYPE TRANSFORMER

The RoMan fixture type transformer is the perfect choice for multi-spot welding applications. This flexible, water-cooled transformer is easy to adapt to your specific application. Built to RWMA specifications, there are many options and configurations available.

  • KVA Range: 25 – 200 KVA
  • Voltage:
    • 240 Volts, 50 Hz
    • 480 Volts, 60 Hz
    • 575 Volts, 60 Hz
  • Options:
    • Secondary Parallel Bar Kit
    • Secondary Series Bar Kit
    • Grounding Reactor
  • Standard models are listed below, contact T. J. Snow for details about models/ voltages not listed.
Model #KVAVolts/ HertzSecondary Volts (min – max)Weight (lbs) 
F48660A1SALX60480 / 603.58 – 5140 
F48685B1SELX85480 / 605.39 – 7.06185Typically in stock
F486120J1SELX120480 / 607.16 – 9.06225Typically in stock
F486150D1SELX150480 / 609.41 – 11.43270Typically in stock
F486200DL1SELX200480 / 6012.63 – 15.5385Typically in stock
 
 
 

MACHINE TYPE TRANSFORMER

RoMan’s machine type transformer is used in a variety of applications such as spot, press, seam, rocker arm and more. This robust, water cooled transformer conforms to RWMA standards. The transformer connects to the welding tooling on the upper and lower knee by bus bars or laminated shunts.

  • KVA Range: 20 – 500 KVA
  • Standard Primary Voltages:
    • 240 Volts, 60 Hz
    • 480 Volts, 60 Hz
    • 575 Volts, 60 Hz
  • Standard models are listed below, contact T. J. Snow for details about models/ voltages not listed.
Model #KVAVolts/ HertzSecondary Volts (min – max)Weight (lbs) 
M44650NB1BNLX50440 / 604 – 7.9339 
M44675NL1BNLX75440 / 605.7 – 10372 
M446100NL1BNL100440 / 606.8 – 10389 
M446150PL1BNLX150440 / 606.4 – 11546Typically in stock
M446200PL1BNLX200440 / 607.45 – 11.28567Typically in stock
M446200PA1BNL200440 / 607.8 – 12.9650 
M446300VA1BOL300440 / 608.6 – 15.71085 
M446400U1BPL400440 / 608.8 – 16.91465 

Where’s my tap switch?

You might have noticed newer RoMan fixture type transformers have an updated design from previous models. The rotary tap switch used to change the secondary voltage output is no longer offered and has been replaced with a stud mount design. To access the stud mount, turn off the welding machine, remove the end plate and connect one wire to the C stud and the other wire to the numbered stud required for your secondary voltage output requirements.

Further information about resistance welding supplies, prices, or what equipment you should use for your application are only a phone call or email away. Feel free to contact us anytime. Information about Weld Checkers and Force Gauges .

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