TPT July 2007

Technology Update

Specialised power source for Cobramatic push-pull systems

Purging system saves time and gas in large pipe and vessel welding Large pipes and vessels can be purged of air quickly and easily – with reported savings of up to 90 per cent in purge gas requirements – using the Argweld ® Quick Purge from Huntingdon Fusion Techniques, UK. According to the company, the system will typically purge a 914mm diameter pipe to below 0.1 per cent oxygen in less than ten minutes, with faster purging for smaller pipes. Savings in time and purge gas consumption are achieved by reducing the volume purged. Two inflatable dams are positioned inside the pipe, restricting the length of the purged section to approximately 75mm on each side of the weld. At the same time, a sleeve joining the dams occupies most of the pipe’s diameter, so that only the space between the outer surface of the sleeve and the inner surface of the pipe needs to be purged. When the Argweld Quick Purge has been positioned inside the pipe, by using pull tags, it is inflated by the inert gas supply so

MK Products, USA, has launched the CobraMig ® 400P, a pulsed MIG welding

while wave pulse and arc control are easily adjusted via the CobraMig 400P operation panel.

power source that works with the Cobramatic wire feed push-pull technology. Exclusive CobraMig 400P software algorithms allow for hard wire and aluminium welding when using the Cobramatic wire feed cabinet (Model 150-006). Wave pulse functions of the CobraMig 400P enable TIG-like welds on aluminium. Wave pulse utilises superimposed low frequency pulse for hard and soft aluminium, which has been proven

The CobraMig 400P is rated at 60 per cent duty cycle in Standard DC and 50 per cent in Pulse DC at 400 Amps maximum. Automatic three-phase voltage sensing allows for either 208/230VAC or 460VAC at 50/60Hz input. Air or liquid cooled Cobra guns can be connected and used on the Cobramatic cabinet.

MK

Products

also

› The new CobraMig 400P pulsed MIG welding power source from MK Products

manufactures MK Orbital™ tube welding systems for exotic alloys and Aircrafter™ table-top rotary positioners.

to reduce porosity and crack susceptibility. The frequency of wave is adjustable from 0.5 to 30Hz. Wire feed speed, amperage and arc voltage are commanded by the wire speed potentiometer in the push-pull welding gun,

MK Products – USA Fax : +1 949 472 1428

Email : sales@mkproducts.com Website : www.mkproducts.com

HighQualityRFComponents for PipeWelding No need to multi-source your electronic components...Richardson Electronics has them all!

Richardson Electronics, a global provider of engineered solutions, is your complete source for RF components used in pipe welding. For decades, the pipe welding industry has relied on Richardson Electronics' vast inventory of high quality, RF welding components. Contact a sales representative today with your requirements and discover the extensive inventory of RF tube and pipe welding components Richardson has to offer.

• Capacitors - Ceramic, Vacuum, Oil-filled, Mica, Film and Electrolytic. Some popular

• High Power Oscillator Tubes - Richardson carries a wide selection of power grid tubes. Some popular tube types include:

types include: TWXF Series DB Series PD, PE, & PS Series 19L Series

AX3060CJ (replaces RS3060CJ) AX3150CJ (replaces RS3150CJ) AX3300CJ (replaces RS3300CJ) AMK60-2 (replaces ITK60-2) AMK120-2 (replaces ITK120-2) YD1202 (replaces BW1184J2) YD1212 (replaces BW1185J2) RS3500CJ

HT57 Series CVDP Series 804 Series

• Impeders - Direct more RF power to your weld by using National impeders. Ferrite cores, casings, and coils are also available. Visit our on-line Impeder Design Center at http://industrial.rell.com/configure.asp

• Technical Assistance - We offer FREE seminars focused on RF heating. Contact us for details on the next seminar in your area. Our engineering team is ready to help you.

Visit www.rell.com/locations.asp for a complete listing of our 70 worldwide locations.

industrial.rell.com • (630) 208-2200 • edg@rell.com

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J uly /A ugust 2007