There are four types of
resistance welding, which can use tungsten copper bonded copper electrode as
welding tip, spot welding, seam welding, butt welding and projection welding.
Spot welding assembles the
weldment into a lap joint and presses it between two cylindrical electrodes to
melt the base metal using resistance heat to form a solder joint, which is
mainly used for thin plate welding. The processes are preloading to ensure good
contact of the workpiece, energizing to form nugget and plastic ring at the
weld, power-off forging, so that the nugget cools and crystallizes under the
continued pressure to form a densely structured solder joint without shrinkage
or cracks.
The process of seam welding
is similar to spot welding, except that the cylindrical electrode is replaced
by a rotating disc-shaped roller electrode, and the weldment is assembled into
a lap or butt joint and placed between the two roller electrodes. The roller
pressure welding is a welding process in which the parts are rotated,
continuously or intermittently, to form a continuous weld. Seam welding is
mainly used for welding structures with relatively regular weld seams and
sealing requirements. The plate thickness is generally below 3mm.
Butt welding welds the
weldment along the entire contact surface.
1.0 Resistance butt welding
Resistance butt welding is a
method of assembling the weldment into a butt joint so that its end faces are
in close contact, using resistance heat to heat it to a plastic state, then the
power is cut off and the upsetting force is quickly applied to complete the
welding.
Resistance butt welding is
mainly used for weldments with a simple cross-section, a diameter or side
length of less than 20mm and a low strength requirement.
2.0 Flash butt welding
Flash butt welding is to
assemble the weldment into a butt joint, turn on the power, and make the end face
gradually move closer to reach local contact, and use resistance heat to heat
these contact points. Under the action of large current, flash is generated to
melt the end face metal until the end when the part reaches a predetermined
temperature within a certain depth range, the power is turned off and the
upsetting force is quickly applied to complete the welding.
The joint quality of flash
welding is better, and the mechanical properties of the weld are equivalent to
the base metal, and there is no need to clean the pre-welded surface of the
joint before welding. Flash butt welding is often used for welding important
weldments. It can weld the same kind of metal, also can weld dissimilar metals;
it can weld 0.01mm metal wire, and also can weld 20,000mm metal rod and
profile.
Projection welding is a
variant of spot welding, there are prefabricated bumps on a workpiece, and one
or more nuggets can be formed at the joint at a time.
The quality of projection
welding is determined by current, power-on time, pressure, and diameter of the
resistor tip.
Whichever the resistance
welding method is chosen, copper tungsten electrode is a necessary part. And it
is used because of its high electricity conductivity. Besides, the shape can be
customized as electrode, rod, round disk, round plate with hole, cup shape,
etc. moreover, even though the regular contents are 70W30Cu and 80W20Cu,
Chinatungsten can also make the parts with certain content as requirements by
the clients for example decreasing the copper content to improve its to-be-cut
property, and increasing the copper content to improve its electricity
conductivity. No matter what kind of issues you are encountering, you are
welcomed to be shared with and CTOMS will try to provide you a suitable
solution and is eager to offer you samples based on the solution.
If you have any inquiry
of tungsten copper electrode, please feel free to contact us:
Email: sales@chinatungsten.com/sales@xiamentungsten.com
Tel.: +86 592 5129696/+86 592
5129595
Fax: +86 592 5129797
Scan QR code of Chinatungsten Wechat
platform to follow up the daily latest price and market of tungsten, molybdenum
and rare earth.
