Description Of Stud Welder; Drawn Arc Stud Welding Technology - Soyer BMH-22i Operating Instructions Manual

3 Description of stud welder

3.1

Drawn arc stud welding technology

Illustration 1: Drawn arc stud welding technology
The BMH-22i SOYER stud welder runs according to the principle of drawn arc stud welding.
A D.C. power supply with inverter technology provides the welding current. For detailed information,
please refer to the following regulations:
• DIN EN ISO 14555, "Arc welding of metallic materials"
• DVS Information Sheet 0902, "Drawn arc stud welding"
1. When welding, the stud is positioned on the workpiece.
2. The preweld current is ignited and the stud is lifted off the workpiece.
3. The subsequent ignition of the main current creates a molten pool between stud and
workpiece.
4. The stud immerses in the liquid molten pool and the material solidifies.
This method allows manual, semi-automatic and fully automatic inseparable welding of threaded
studs, pins, tapped studs, insulating pins, special studs and many other fasteners made of steel, CrNi
steel, heat-and acid-resisting steel with the workpieces. Conditionally it is also possible to weld nickel
and titanium depending on the respective requirements. Standard studs for drawn arc and capacitor
discharge welding in compliance with DIN EN ISO 13918 can be welded without requiring any
auxiliary aids. The application of shielding gas or ceramic ferrules is recommended for studs with a
diameter of more than 6 mm to prevent pore formation and to optimise the formation of bulges.
The standard BMH-22i stud welder is suitable for operation with shielding gas and ceramic ferrules. A
D.C. power supply with inverter technology provides the welding current.
IMPORTANT INFORMATION
Ensure that the surface is electroconductive.
Grind hot galvanized parts.
The following welding methods are possible when using the BMH-22i SOYER stud welder:
• Short-cycle drawn arc stud welding without shielding gas and ceramic ferrules
• Drawn arc stud welding using ceramic ferrules as auxiliary aid
• Drawn arc stud welding using shielding gas as auxiliary aid
• Manual electric welding (electrode welding)
• TIG welding
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BMH-22i