22
9 Welding Process
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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 2 000 ms. It is generally suitable for all welding positions. When stud welding with
ceramic 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
solidification 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
constructed with a small pressed-in aluminium ball.
Studs with cone-shaped front area and aluminium ball are preferably
used with ceramic ferrule.
NOTE!
Ceramic ferrules, shielding gas or aluminium balls are not nessesary
for the use of STAUFF internal thread welding studs M6.