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Displaying items by tag: PWM

Cold pressure welding offers wire and cable manufacturers a quick, clean, cost-effective method of bonding non-ferrous wires, strip and profile, without heat, flux or fillers. The process can also be used to join non-ferrous materials of different types and of different diameters. Fine wire can be joined in seconds using small manually-operated cold welders. Powered machines are required to weld larger wire and rod sizes, but use considerably less power and take less time to produce welds than electrical butt welders.

British company PWM, which specialises in the design, manufacture and supply of high-performance cold welding equipment, produces a range of manual and powered machines for material 0.10mm to 30mm. 

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The range includes three energy-efficient cold welders for rod 5mm to 30mm. These low maintenance machines require no set up, and are very cost-effective and simple to operate.

The EP500 model, for rod 5mm to 15mm, is pneumatically-powered. It can be connected to either a central air supply or a dedicated compressor, using a 12-mm internal diameter reinforced hose.  Only the control system, which the operator uses to set the weld parameters, requires an electrical supply.

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The largest machine in PWM’s range, the P1500 model, can weld 25mm copper and 30mm aluminium.  Powered by three hydraulic pumps, it requires only a small current to drive the 11kw pump motor.

The compact P1000 hydraulic rod welder has quick release dies and an easily adjustable die setting mechanism. It can be used for welding copper rod 6mm to 16mm and aluminium 6mm to 20mm.

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PWM also manufactures industry-standard and custom-made cold pressure welding dies for round or profile wire and rod. New PWM products are available only from PWM or authorised distributors. The company’s international network of experienced agents provides a personal, on-site service, with full back up and after-sales support.

Video demonstrations of all PWM’s machines can be viewed at www.pwmltd.co.uk.

Further information from:

Steve Mepsted

PWM Ltd

This email address is being protected from spambots. You need JavaScript enabled to view it.

www.pwmltd.co.uk

Published in Processing
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A customised cold welding system developed by British company PWM in partnership with US manufacturer Virtus Precision Tube (formerly Luvata) has streamlined and improved the process of copper tube production.

The system has improved uptime, reduced costs and created a better working environment for operators, according to Joe Napier, VPT’s Engineering Program Manager.

“We produce over 40 million pounds of roll-and-weld copper tube each year, in sizes from 1/4" to 1/2", he said. ”The cold welding system we have developed with PWM is part of our continuous improvement program. It supports our on-going drive to develop high-performance tubing solutions for the HVAC and refrigeration heat exchanger markets.

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“Copper strip is supplied in large narrow rolls and approximately every 20 minutes, the tail end of one roll has to be joined to the head of the next roll. The new cold welding process is more straightforward than the crossweld process we used for a decade, and works the first time, every time.  It’s faster, easier to standardise, requires less operator input and training. Most advantageous of all, the new weld is stronger and capable of handling the tensions we place on the strip during tube production.”

Before approaching cold weld specialists PWM, VPT also tried alternative methods of joining strip such as brazing, dovetail profiles, lap joints and laser welding.

PWM successfully test welded VPT’s strip using a portable ST40 cold pressure welding machine, capable of joining copper strip as wide as 45mm wide and as thin as 0.2mm. Precision engineered to create reliable permanent welds stronger than the parent material, the ST40 enabled VPT to reduce the operational scrap rate on the line by 15% during production trials.

PWM has now supplied VPT with three ST40 welders that run full-time in production.

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Adaptations such as automatic flash trimming and annealing of the weld (to soften it and make it less brittle), and automation of the weld cycle and die opening system have been developed to streamline the process. VPT will field the new system across all tube mill production lines and currently has four more ST40 units on order with more to follow.

“Technical assistance from PWM, particularly from its Chief Design Engineer, Ivan Turner, has been incredible throughout,” said Joe Napier. “Any problems we had during the development and early fielding of the units were quickly resolved. For example, we went through four design improvements to arrive at our current tooling.”

Steve Mepsted, Managing Director of PWM, said: “This has been a fascinating bespoke project to work on. VPT shares our commitment to quality and innovation and together we’ve created a customized welding solution that significantly improves business performance. We’re delighted with the outcome.”

Published in Production
Tagged under

A customised cold welding system developed by British company PWM in partnership with US manufacturer Virtus Precision Tube (formerly Luvata) has streamlined and improved the process of copper tube production.

The system has improved uptime, reduced costs and created a better working environment for operators, according to Joe Napier, VPT’s Engineering Program Manager.

“We produce over 40 million pounds of roll-and-weld copper tube each year, in sizes from 1/4" to 1/2", he said. ”The cold welding system we have developed with PWM is part of our continuous improvement program. It supports our on-going drive to develop high-performance tubing solutions for the HVAC and refrigeration heat exchanger markets.

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“Copper strip is supplied in large narrow rolls and approximately every 20 minutes, the tail end of one roll has to be joined to the head of the next roll. The new cold welding process is more straightforward than the crossweld process we used for a decade, and works the first time, every time.  It’s faster, easier to standardise, requires less operator input and training. Most advantageous of all, the new weld is stronger and capable of handling the tensions we place on the strip during tube production.”

Before approaching cold weld specialists PWM, VPT also tried alternative methods of joining strip such as brazing, dovetail profiles, lap joints and laser welding.

PWM successfully test welded VPT’s strip using a portable ST40 cold pressure welding machine, capable of joining copper strip as wide as 45mm wide and as thin as 0.2mm. Precision engineered to create reliable permanent welds stronger than the parent material, the ST40 enabled VPT to reduce the operational scrap rate on the line by 15% during production trials.

PWM has now supplied VPT with three ST40 welders that run full-time in production.

Adaptations such as automatic flash trimming and annealing of the weld (to soften it and make it less brittle), and automation of the weld cycle and die opening system have been developed to streamline the process. VPT will field the new system across all tube mill production lines and currently has four more ST40 units on order with more to follow.

“Technical assistance from PWM, particularly from its Chief Design Engineer, Ivan Turner, has been incredible throughout,” said Joe Napier. “Any problems we had during the development and early fielding of the units were quickly resolved. For example, we went through four design improvements to arrive at our current tooling.”

Steve Mepsted, Managing Director of PWM, said: “This has been a fascinating bespoke project to work on. VPT shares our commitment to quality and innovation and together we’ve created a customized welding solution that significantly improves business performance. We’re delighted with the outcome.”

Published in Ferrous Tube / Pipe
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2016-04-05 164538British company PWM, leading manufacturer of cold pressure welding equipment for over 30 years, is launching two new cold welding machines at wire 2016 (stand 9B41).

The ST40 air/hydraulic strip welder is designed for joining non-ferrous strip and tape used on armouring lines. The machine, for strip and tape up to a maximum width of 45mm (1.772) and a maximum cross sectional area of 33mm² (0.0514²), produces strong, reliable bonds stronger than the parent material without loss of electrical integrity. No set up time is required, and, like all PWM welders, the ST40 is low maintenance, simple and cost effective to operate. Mounted on a trolley, the ST40 can be wheeled easily to the work area, saving effort and reducing downtime.

The new HP180 air/hydraulic cold welder is a versatile machine for wire sizes 0.30mm to 1.80mm (.0118” to .071”). Supplied on a trolley, it can also be hand-held (within the limit of the air supply pipe) if required. Quick and easy to use, the HP180 enables the operator to produce strong consistent welds without effort.

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Also on show will be PWM’s powerful energy-efficient electro/pneumatic and electro/hydraulic rod welders for joining large rod sections from 5mm to 30mm (.197” to 1.181”), and its comprehensive range of manual cold welders, for wire sizes 0.10mm to 5.00mm (.0039” to .197”). This includes lightweight hand-held machines, as well as larger portable models which can be used on a workbench or with a trolley.

Published in Processing
Tagged under

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