HBS ARC 1550 Operating Manual page 26

9 Welding Process
With shielding gas, you should only weld in position PA (vertical) because
due to gravity, the shielding gas cannot prevent flow of the molten metal.
PE
(Overhead position)
PA
(Vertical position)
Short-Cycle Drawn-Arc Stud Welding with Shielding Gas
Short-cycle drawn-arc welding with shielding gas is used for welding elements within
a diameter range of 3 to 12 mm (nominal diameter without flange) and welding times
between 5 and 100 ms
Due to the short welding times, the energy input and the weld pool are so small that
also welding elements up to 12 mm diameter can be welded on thin workpieces.
Normally, welding elements with flange (according to current standards) are used,
which forms a larger welding area compared with the shaft diameter. In this way,
higher tensional forces than in the stud shaft can be transmitted in spite of some
pores in the weld zone. To minimize pore formation, the use of shielding gas for stud
diameters upwards of 8 mm is recommended.
Drawn-Arc Capacitor-Discharge Stud Welding
With drawn-arc capacitor-discharge stud welding, the welding energy is taken from
a capacitor. As a result, welding currents are very high and welding times (< 10 ms)
very short. Normally, a weld pool protection is not required. The process is mainly
used for welding elements in a diameter range of up to 8 mm.
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