HBS ARC 1550 Operating Manual page 25

Drawn-Arc Stud Welding with Shielding Gas
Drawn-arc stud welding with shielding gas is used with welding elements for a
diameter range of 3 to 12 (16) mm and with welding times from 50 to 2000 ms.
Principally, it is suitable for all welding positions, however, it is preferably used in
vertical position PA. With stud welding with shielding gas, the weld area is protected
by shielding gas. The shielding gas, which is fed from outside through a gas control
and an additional device, displaces the ambient atmosphere from the welding area
and reduces considerably pore formation.
Mild steel / stainless
steel
Aluminium and Alumini-
um alloys
*)
As a result of the higher amount of CO
pool is reduced, which may lead to increased spatter formation.
**) For larger plate thicknesses the helium content may be increased.
The shielding gas influences
– the arc and the melting behavior of welding element and workpiece,
– the development of the weld collar and the penetration shape via the surface tension.
With stud welding with shielding gas, the shape of the weld collar is not reproducib-
le, as the shielding gas has no forming effects on the melt – different from a ceramic
ferrule. And so an additional ceramic ferrule may be used in special cases.
The standard welding elements and ceramic ferrules for drawn-arc stud welding are
described in several standards. Welding elements with cone-shaped front area and
without an aluminum ball are preferably used.
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Recommendation accor-
ding
DIN EN ISO 14175-M21:
(82 % Ar / 18 % CO
DIN EN ISO 14175-I1
DIN EN ISO 14175-I3
Studs with cone-shaped front area preferably used under shielding
gas.
9 Welding Process
Recommendation accor-
ding HBS
90 % Ar / 10 % CO
) 92 % Ar / 8 % CO
2
85 % Ar / 15 % He
70 % Ar / 30 % He **)
the surface tension of the weld
2
*)
2
*)
2
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