TPT September 2011

125 / 199

S eptember 2011 123 ›
Welding equipment
A better welding effect
HIGH Tech Extrusion, consisting of the
companies Theysohn, Technoplast, Topf
and Extruder-Komponenten Salzgitter, is
an “all-in-one” provider that has developed
a unique series of extrusion lines, tools
and pipe heads. After presenting the new
OMNIA line for profile extrusion, High Tech
Extrusion developed new and innovative
products for the pipe extrusion market: a
complete new OMNIA XTR extruder series
and a “RK Streamliner” pipe head with
some of the following advantages:
• higher melt pressure after the torpedo
and therefore a much better welding
effect
• by reason of the higher melt pressure
after the torpedo, high melt pressure in
the die set is no longer necessary for
achieving an optimum pipe quality
• shorter die sets
• wider pipe diameter range for each pipe
head.
The new “RK Streamliner” pipe heads
are available for single strand extrusion
from 12 to 400mm and for double strand
extrusion from 12 to 63mm and 20 to 110mm
respectively. High Tech Extrusion is the
umbrella brand name for the four extrusion
specialists Theysohn, Technoplast, Topf
and Extruder-Komponenten Salzgitter.
High Tech Extrusion operates
internationally with four production locations
in Austria and Germany as well as sales
offices in Moscow and India. This group
of companies, which bundles 30 years of
experience in extrusion technology, belongs
to HTI High Tech IndustriesAG, a technology
group offering high-tech products for
engineering and energy technology.
High Tech Extrusion GmbH
– Austria
Email:
Fax: +43 5969 22202
Website:
Latest generation of high frequency welders
THE process of welding tube and pipe
requires skilled operators using precision
welding equipment. Since the industry’s
transition to solid-state welders, operators
have grown comfortable with higher quality
and higher productivity. But the welders
being used by many tube producers are
lacking a critical degree of control. The
latest generation of high frequency (HF)
welders provide independent control of
power (kW) and frequency (kHz) enabling
fine control of heat input to the weld.
Successful solid-state welding of tube
and pipe requires meticulous adjustment of
the heat affected zone (HAZ) by the welder.
With older HF welders, the operator tries to
find the ideal welding power to achieve a
desirable weld characteristic. But welding
power is only one of the electrical variables
that influence the weld HAZ. The latest forge
welding research points to the critical nature
of weld frequency as a highly sensitive
process parameter. Welding frequency is
a controlling variable for electrical reference
depth. With Thermatool’s variable frequency
welder, frequency can be adjusted while
welding from the console between 250kHz
and 400kHz. This allows an operator not
only the ability to increase power, but also to
control the depth of penetration of the weld
power. Control of the weld HAZ is the result.
By adjusting variable frequency
alongside welding power an operator can
compensate for changes in mill speed,
new materials or alloys, changes in wall
thickness, difficult d/t ratios, and changes
in impeder performance. Changes in vee
length are a thing of the past with a new vee
axis servo controlled coil-positioning feature,
standard with HAZControl Technology™.
For operators, the ability to change a
new influencing process variable could
add a degree of complexity. To address
this, Thermatool has developed HCT:
HAZControl Technology™. This software
requires the users to enter in values for
material properties like diameter and wall,
as well as production variables like vee
length and coil geometry. The software uses
all of these variables along with mill speed
and in process welder operating conditions
to calculate and characterise the HAZ.
The HCT software recommends an initial
welding frequency and power and from there
the operator determines the “best weld” for
the product. The welder then stores the data
as a recipe that can be used as a standard for
future production. This allows the skill of the
best operator to be shared with those that are
new and prevents divergence from a standard
that is known to produce exceptional product.
HAZControl Technology brings a new
standard to the tube and pipe industry:
a standard of control, precision and
unequalled performance.
Thermatool Corp – USA
Email:
Website: