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RT - RL
Resistance welding

RT - RL

SEAM RESISTANCE WELDING

ENABLES TO OBTAIN WATER TIGHT SEAM WELDING

RT – RL Seam welders range are standard supplied for monophase mains connection. Three phase versions, also with Medium Frequency inverter (1000 Hz), are available for special applications. Medium frequency machine grants high speed welding and enables to join hardly weldable parts with reduced deformation. The wide range of the equipment configurations enables to obtain water tight seam welding of cylinders, fire estinguishers, radiators, tanks and similar items with excellent quality results.

Seamwelding technology

Seam welding is a welding process by electric resistance. In such joining process overlapped metals are welded under pressure by a sequence of spots made by copper alloy rotating discs. Depending on the choice of the parameters, such as spot frequency and rotation speed of the electrodes, two typical joints are usually achieved.

  • Fig. A represents the welding pattern made by choosing a short welding time with a long pause time. This is for joining two metals without water tight welding.
  • Fig. B shows the welding pattern made by adjusting welding and pause times in a way that each spot is overlapped by the next one. This joint allows water tight welding.

Other characteristics

  • RT version for transversal welding only
  • RL version for longitudinal welding only
  • Water cooled seam heads with silver contacts, ensuring a good current transmission from the static part to the shaft
  • Reduced maintenance costs
  • Self-lubricated pneumatic components to eliminate oil deposits and to safeguard the environment from contaminants
  • Frequency converter to adjust the welding speed of the discs

Gallery

RT - RL at work

Datasheet

RT - RL: Technical features

TECHNICAL DATA RT 80 RT 80 2T RT 81 RT 180 2T RL 81
Single phase input 50/60 Hz V 400 400 400 400 400
Rated power 50% kVA 60 60 80 180 80
Installed power  kVA 60 60 80 180 80
Fuse(delayed action) A 150 150 200 400 200
Open circuit voltage V 5,1 5,1 6,7 9,5 6,7
Throat depth mm 450 450 800 450 800
Work stroke mm 80 80 80 100 80
Electrode force at 600kPa(6bar) daN 470 470 470 1200 470
Max welding capacity on mild steel mm 1,2 + 1,2 1,2 + 1,2 1,2 + 1,2 2 + 2 1,2 + 1,2
Max welding capacity on stainless steel mm 1,5 + 1,5 1,5 + 1,5 1,5 + 1,5 3 + 3 1,5 + 1,5
Dimensions (LxWxH) mm 1150 x 800 x 2020 1150 x 800 x 2020 1450 x 800 x 2100 1450 x 800 x 2100 1450 x 800 x 2100
Weight kg 800 900 900 1540 900
Drive head A A+B B A+B B
Driving system C E D E D
DRIVE HEAD
A = lower
B = upper
DRIVING SYSTEM
C = toothed belt
D = direct with hooke’s joint
E = differential

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