A 415 V 3-phase drawn arc stud welding machine for welding threaded studs from M3 to M12 onto steel.

The Ralli Wolf RDA-120 is a stud welding machine that fixes studs to metal in a fraction of a second, without drilling, tapping, or bolting. In drawn arc stud welding, a stud is placed in a hand-held stud gun and set on the workpiece. The gun lifts it slightly to draw an arc, which melts the end of the stud and a small spot on the workpiece, and then the stud is plunged back into the melt to form a strong, full-section weld. Welding happens from one side only, so the back of the plate stays clean. The machine takes stud sizes from M3 to M12, and the 3-phase 415 V supply suits workshop and plant use. It is made for steel fabricators, shipbuilders, boiler and tank makers, elevator and switchgear manufacturers, and structural steel contractors.

Key Features

Drawn arc stud welding process: strong, full-section stud welds
M3 to M12 stud capacity: covers small and medium threaded studs
415 V, 3-phase supply
One-sided welding: no marks on the back of the plate
Fast, repeatable welds: no drilling, tapping, or bolting needed
Industrial build for workshop and plant use

Application

Welding threaded studs to steel plates and sections
Structural steel and building fabrication
Shipbuilding and boiler and tank manufacturing
Switchgear, panel, and enclosure manufacturing
Elevator, rail, and heavy equipment fabrication
Production lines needing repeatable stud fixing

Technical Specification

Specification	Detail
Brand	Ralli Wolf
Model	RDA-120
Product Type	Drawn Arc Stud Welding Machine
Process	Drawn arc stud welding
Stud Capacity	M3-M12
Supply Voltage	415 V, 3-phase
Welding Current	[add from data sheet]
Input Power	[add from data sheet]
Duty Cycle	[add from data sheet]
Weight	[add from data sheet]
Included Accessories	[add from data sheet: stud gun, cables, chuck sets, etc.]

Safety Note:

For use by trained operators only. Wear welding eye protection, gloves, and flame-resistant clothing. Install on a correctly rated 415 V 3-phase supply with proper earthing by a qualified electrician. Use only the stud types and materials the manufacturer approves, keep flammable materials away from the work area, and keep people with pacemakers away from the welding circuit.

Ralli Wolf RDA-120 Drawn Arc Stud Welding Machine, 415V 3-Phase, M3-M12 Stud Capacity, for Structural Steel, Shear Connectors and Fabrication

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