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Drawn Arc Process (ARC)

Large studs and high-quality welds,

that is what makes drawn arc processes so convincing

  1. Range of application:
  •  The drawn arc process is suitable for studs from 2 mm up to 25 mm.
  •  A wide variety of stud shapes can be welded.
  • In particular, threaded studs, pins, insulation pins, bayonet pins, internally threaded bushes, concrete anchors and flat anchors made of St37, 15Mo3, 1.4301, 1.4713/42/62 and 1.4841 are possible.
  1. Process types:

Drawn arc stud welding is divided into 3 main processes: short-cycle stud welding, drawn arc stud welding with ceramic ferrule and drawn arc stud welding with shielding gas. The 3 processes are explained in more detail below, along with their application strengths and technical details.

Symbol Hub mit Keramik

Symbol Hub mit Keramik

Symbol Hub mit Keramik

Drawn Arc Overview

 

 

ParameterShort-cycleDrawn arc with ceramic ferruleDrawn arc with shielding gas
Stud size d (mm) 2-10 5-25 2-12
Peak current approx. (A) 300-1,900 300-3,000 300-3,000
Welding time approx. (ms) 5-100 100-2,000 5-2,000
Surface Bright metal, galvanised (suitable for poorer surfaces) Bright metal, light rust, mill scale (rougher surfaces) Bright metal, galvanised (suitable for poorer surfaces)
Min. workpiece thickness (mm) 1/8 d (stud) 1/4 d (stud) 1/8 d (stud)
Ceramic ferrule required no yes no
Shielding gas function required conditionally no yes
Visual appearance of the weld good good very good
Cheaper studs yes no no
Insulation applications yes yes yes
Material Steel, stainless steel, brass, aluminium
(and others)		 St37, 15Mo3, 1.4301, 1.4713/42/62, 1.4841
Heat-resistant		 St37, 15Mo3, 1.4301, 1.4713/42/62, 1.4841
Heat-resistant
Application strengths
  • Very high process reliability
  • Well suited for poor surfaces
  • Easy to automate
  • Drawn arc welding of thin sheet
  • Required for drawn arc studs with d > 5 mm and longer welding times to stabilise the weld pool
  • The ceramic ferrule has a beneficial effect on the weld microstructure
  • Use with large studs
  • Produces significantly higher-quality welds
  • Prevents porosity
  • Focuses the energy at the weld point
  • Easy to automate (for large studs using the pick-up process)
Good to know
  • Deeper penetration than tip ignition = higher likelihood of marks and temper colours on the reverse side
  • Higher weld build-up can sometimes make assembly more difficult
  • Limited suitability for automation
  • Requires ceramic ferrules
  • Ceramic ferrules must be fitted individually
  • Ceramic ferrules cannot be fed automatically
  • Very deep penetration
  • Requires shielding gas function on the unit
  • Produces very high-quality and visually appealing welds
  • More sensitive to arc blow at workpiece edges and with asymmetrical earth points
Values may vary depending on equipment and application