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KAH 412 LA - Automatic Stud Welding Head

The KAH 412 LA automatic stud welding head combines precise piston guidance with automatic length compensation for consistent stud welding on sheets from 0.5 mm. It handles M3–M8 studs and 8–40 mm lengths, while its zero-play linear bearing and lift damper help compensate for stud and workpiece variations during automated production.

Automatic Stud Welding Head - KAH 412 LA

Description / Features

Technology

  • Automatic length compensation for stud and height variations
  • Zero-play linear guidance for precise piston movement
  • Lift damping to reduce piston rebound
  • Integrated adjustment for lift and spring pressure
  • Electronic control for consistent operation
  • Automatic feeding directly into the chuck

Application

  • Especially suitable for thin metal sheets from 0.5 mm.
  • Automatic compensation of length tolerance of welding elements through integrated length adjustment

Structure

  • Zero-play ball linear bearing for guiding the welding piston, to ensure maximum precision and reproducibility for welds
  • Sealed welding piston guidance
  • Integrated lift and spring-loaded adjustment
  • Pushbutton detent system to facilitate changing the feeding tube
  • Electronically controlled

Safety

  • Lock-in spring adjustment
  • Lock-in lift adjustment
  • High level of security to prevent the selected settings being changed inadvertently
  • Guidance system protected against spatters

Welding

  • Individual adjustment options for optimum welding results
  • Reproducible piston movement with minimized rebound effect for optimum welding quality via lift damper
  • Automatic length compensation
  • Welding on painted sheets possible (clean, smooth and flat surfaces and grounding required)
  • Manual or fully automatic stud feed possible (welding element is automatically pushed through the feed tube in the chuck)

SPECIFICATIONS

Welding range M3 to M8, dia. 3 to 8 mm; #4 to 5/16", dia. #4 to 5/16"
(dia. 10 to 12.7 mm; dia. 3/8" to 1/2" with modification only)
Stud length 8 to 40 mm; 0.31" to 1.57" - (other lengths on request)
Stud type Welding elements with flange according to current standards (other studs on request)
Stroke/Length compensation 0.2"/0.08", 0.16"/0.12"
Spring pressure Arresting
IP Code IP 20
Workplace noise level > 90 dB (A) may occur during welding
Dimension LxWxH 375 x 66 x 145 mm, 14.76" x 2.60" x 5.71" with chuck and quick change system
Weight 3.4 kg; 7.50 lbs
Order No. 94-37-412 (with length compensation)
Equipped for one standard stud dimension according to customer request

Where the KAH 412 LA Fits

Application Why It Fits
Thin Sheet Welding Designed for sheets from 0.5 mm.
Variable Workpiece Heights Automatic length compensation handles height variation.
Stud Length Variation Compensates for welding-element length tolerances.
CNC Production Welding Controlled piston movement suits automated systems.
Automated Production Supports automatic stud feeding.
Sheet Metal Fabrication M3–M8 range covers common flange studs.
OEM Production Repeatable compensation supports recurring production.

KAH 412 vs. KAH 412 LA

Feature KAH 412 KAH 412 LA
Stud Range M3–M8 M3–M8
Stud Length 8–40 mm 8–40 mm
Digital Piston Display Yes No
Automatic Length Compensation No Yes
Lift Damper No Yes
Automatic Feeding Yes Yes

When to Choose KAH 412 LA

  • Variable stud lengths
  • Uneven workpiece heights
  • Thin sheets from 0.5 mm
  • Automated stud welding
  • CNC production welding
  • Applications requiring repeatable piston movement

FAQs

The KAH 412 LA is an automatic stud welding head with integrated length compensation. It is designed to maintain controlled stud positioning when welding element length or workpiece height varies.

Automatic length compensation adjusts for stud length tolerances and workpiece height variations, helping maintain consistent welding geometry without requiring manual correction for every component.

The key difference is the integrated automatic length compensation in the KAH 412 LA. It is designed for applications where stud length or workpiece height variation can affect consistent welding positioning.

The standard range is M3–M8 / #4–5/16", with 10–12.7 mm / 3/8–1/2" studs possible with modification. Standard stud lengths range from 8–40 mm.

Yes. The KAH 412 LA is especially suitable for sheets from 0.5 mm and provides controlled piston movement and length compensation for thin-sheet stud welding applications.

Yes. Its automatic feeding capability and controlled piston movement make the KAH 412 LA suitable for integration into CNC and automated stud welding systems.

The integrated lift damper minimizes piston rebound, helping produce more controlled and reproducible piston movement during the welding cycle and supporting consistent weld quality.

Yes, provided the surface is clean, smooth, and flat, and proper electrical grounding is established. Suitability ultimately depends on the coating and welding application.

APPLICABLE STUD WELDERS

Arc Stud Welder - Arc-800 AT
ARC-800 AT
M3 to M12 - #4 to 1/2"
Robust transformer with automation function.
Inverter Arc Stud Welder - IT 1002 AT
IT 1002 AT
M3 to M16 - #4 to 5/8"
All-rounder for automation.
Precise welding results through advanced inverter technology.
Inverter Arc Stud Welder - IT 90 AT
IT 90 AT
M3 to M24 - #4 to 1"
4 outputs (optional), process monitoring and shielding gas.
For critical surfaces (e.g. galvanised).
Inverter Arc Stud Welder - CPW-Series
CPW-Series
M3 to M8 (Dia. 10/12/12,7 mm only possible with modification)
Entry-level CNC stud welding machine with 1 welding head.
High speed with highest positioning accuracy by robust machine base frame.
Working with different work piece heights on a working range of 600 x 420 x 120 mm.
Inverter Arc Stud Welder - MPW-Series
MPW-Series
M3 to M8 (Dia. 10/12/12.7 mm only possible with modification)
High performance CNC stud welding machine (with up to 4 welding heads).
Highest speed possible with high positioning accuracy through rugged design.
Very short set-up time (a.e. automatic calibration of Z-axes).
Network connection.