HBS ARC 1550 Operating Manual page 24

9 Welding Process
Drawn-Arc Stud Welding with Ceramic Ferrule
Drawn-arc stud welding with ceramic ferrule is used with welding elements of 3 to
25 mm diameter (preferably above 12 mm diameter) and with welding times of 50 to
2000 ms. It is generally suitable for all welding positions. When stud welding with ce-
ramic ferrule, the welding position is PA (vertical). The major part of all applications
applies to this procedure.
The ceramic ferrule (CF):
– prevents atmosphere from getting to the weld pool by a formation of metal vapor
in the arc chamber
– stabilizes and concentrates the arc, thus decreasing the arc blow effect
– forms the melt under pressure to a weld collar and supports the weld pool on a
vertical wall and overhead
– protects the welder from arc radiation and welding spatters
Normally, the ceramic ferrule is used for only one weld and is removed after solidifi-
cation of the weld pool.
Standard welding elements and ceramic ferrules are described in several standards.
When using concrete anchors or shear connectors the front area can be plane cons-
tructed with a small pressed-in aluminum ball.
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Studs with cone-shaped front area and aluminum ball are preferably
used with ceramic ferrule.
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