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J

anuary

2011

55

T

echnology

U

pdate

Please send your company’s editorial for free

publication, to be received at least 30 days

before the 1

st

of the month of publication, or visit:

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April 2011

• Stainless steel tubes

• Civil engineering products

• Show feature:

Tube Russia 2011

July 2011

• Valves

• Corrosion resistant

tube & pipe

• Show feature: Tube Southeast Asia 2011

TheWorld of Tube& Pipe Products,Materials&Ancillaries

January 2011

www.read-tpi.com

Forthcoming features

EWM Hightec Welding’s versatile alpha Q

MIG/MAG welding and brazing machine

features a highly dynamic, fully digital inverter

power source designed to offer exceptional

quality, whether working on thin or thick metal

sheets, seam roots or final passes.

alpha Q features the award-winning

forceArc

®

andcoldArc

®

processtechnologies,

and with its inverter power unit with

sophisticated microprocessor technology

also boasts additional processing options

such as pulse welding and pipeSolution

®

,

the latest development from the EWM

research department.

Advantages of this technology when

working on metal sheets and pipes in all

positions include quick, dependable and

high-quality MAG root welding, whether

for manual or mechanised work (eg orbital

technology), with or without an air gap, on

unalloyed or low-alloy steels or with solid

wires. The arc is especially powerful and

therefore very directionally stable, no matter

what the thickness of the material or the

position of the metal sheet or pipe. These

strengths are particularly beneficial when

constructing pipelines, pipe systems and

pressure vessels.

Once the root has been welded, the

alpha Q changes process on demand and

welds the filling passes and the final pass

with a pulsed MAG process.

coldArc is a suitable process for work

requiring the lowest possible heat feeding

and weld spatter. The process offers

excellent gap bridging when welding root

passes on unalloyed, low- and high-alloy

steels, regardless of the panel thickness

or the position (including out-of-position

welding). Other advantages of welding and

brazing processes where heat transfer to

the parent metal is kept to a minimum

include increased safety with irregular air

gaps, minimum distortion, less post-weld

work thanks to excellent seam geometry –

particularly good for visible seams – narrow

discolouration zone, reliable edge formation

even with edge misalignments, no wire

piercing and no pool support required.

One of the system’s users reports that in

their day-to-day production processes they

now use controlled drop transfer to insert

consumables into joints measuring up to

1cm in width, as this enables them to create

the perfect seam root without any need for

a pool support.

coldArc also offers advantages when

performing MIG welding on thin metal sheets,

including gap bridging, no sagging of the

molten metal and good wetting of the surface.

The forceArc MIG/MAG process, with a

very short but powerful spray arc, ensures

deep fusion penetration and virtually spatter-

free seams on unalloyed, low- and high-

alloy steels, without undercuts. The arc is

directionally stable and achieves root and

edge formation even with a 40mm free wire

end (stickout).

forceArc is able to make full-depth welds

with a single layer. This means that the

conventional backing pass is no longer

necessary and the effective throat thickness

required by the standard is realised on the

reverse of the workpiece in a single operation.

In many cases this kind of weld does not

even require special seam preparation.

EWM Hightec Welding GmbH

– Germany

Fax: +49 2680 181 244

Website:

www.ewm-group.com

MIG/MAG welding performance