+44 (0)1827 254 829 sales@prospot.co.uk

British Federal – Stronghold Spot-Welder – 75 Stronghold / 100 Stronghold / 150 Stronghold

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Product Description

Stronghold welding machines set the standard for multi-purpose resistance welding equipment, having adjustable reach for spot welding. They are easily adapted for projection welding and are available as a seam welding version.

Standard Features for spot welding include:-

>    ADAPTABILITY – Infinitely adjustable reach from 500-800mm.
>    HIGH QUALITY WELDING – Choice of weld control.
>    PRODUCTIVITY – Welding speeds up to 250 spots per minute.
>    RELIABILITY – 50% duty cycle encapsulated transformer.
>    VERSATILITY – Simple adaption to projection welding.

Stronghold can be fitted with a range of AC Weld Transformers (100 to 150kVA) or MFDC Transformers (100 to 250kVA) as well as a choice of Weld Controls and other options.

MFDC offers the following added benefits –

>     Improved weld quality.
>     Reduced Power consumption costs.
>     Lower peak currents providing increased electrode life.
>     3-phase even load distribution.
>     Ideal for welding coated materials and Aluminium.
>     Weld times reduced through increased rate of heat input to work piece.
>     Reduced weld splash owing to lower peak currents.
>     Can be retrofitted to existing machines.

Optional extras:

> Retract/high lift and or 160mm air cylinder.
> 100KVA , 150KVA single phase AC or 100KVA 3-phase DC Medium Frequency Transformer.
> Load Cell for Force verification
> Nut Verification System
> Water Flow Sensors
> Electro-pneumatic regulator for automatic adjustment of weld force with weld program selection.  (Compatible weld control required).
> Manual or Inline versions available
> Linear Transducer for Head Travel position
> Closed circuit water cooled system.
> Integration of automatic nut and bolt feed machines.

Technical Specifications 75 Stronghold 100 Stronghold 150 Stronghold
Continous power @ 100% duty cycle Sp kVa 53 71 106
Max short circuit power Scc kVa 290 360 460
Max welding power Smax kVa 230 290 360
Nominal power @ 50% duty cycle S50 kVa 75 100 150
Nominal supply voltage U1n V 380 / 440 380 / 440 380 / 440
Continuous primary current at 100% DC I1p A 130 170 250
Supply frequency Hz 50 50 50
Supply phases 2 2 2
Supply capacity kVa 170 210 300
HRC fuse size to BS88 A 160 200 315
Feed cable c.s.a up to 30m. long mm² 50 70 95
Max short circuit primary current I1cc A 690 860 1200
Max short circuit secondary current I2cc A 32,000 35,000 42,000
Max welding current I2max A 25,000 28,000 33,000
Duty cycle for max welding Xmax % 5.4 6.1 7.1
Continuous secondary current at 100% DC I2p A 6,000 7,200 8,900
Number of taps 3 3 3
Secondary open circuit volts U20 V 8.8 / 8 / 7 9.9 / 8.8 / 8 11.9 / 10.4 / 8.6
Weld cylinder mm 125 125 160
Weld force min/max with a 1.5/5.5 bar supply kN 1.8 / 6.7 1.8 / 6.7 3.0 / 11.0
Weld force min/max with an 20/80 psi supply 1bf 400 / 1,500 400 / 1,500 650 / 2,500
Weld cylinder stroke max mm 76 76 76
Air pressure normal bar 5.5 5.5 5.5
Air pressure max operating bar 7 7 7
Air connection/hose size BSP/in 1/2″ / 1/2″ 1/2″ / 1/2″ 1/2″ / 1/2″
Cooling water min operating pressure bar 3 3 3
Cooling water consumption Lit./min 20 20 20
Cooling water max inlet temp °C/°F 30 / 86 30 / 86 30 / 86
Cooling water connection/hose size BSP/in 1/2″ / 3/4″ 1/2″ / 3/4″ 1/2″ / 3/4″
Shipping specifications Machine size mm 590W x 1350D x 1685H 590W x 1350D x 1685H 590W x 1350D x 1685H
Machine weight kg 595 595 655

All of our machines are priced and sold as ‘Machine Only’ if you wish to have us deliver, Install and/or commission your new purchase, please request prices from our Sales Team. We offer a full range of services to suit all sizes of business and budgets.

+44 (0)1827 254 829

sales@prospot.co.uk