The Drawn Arc Nut Welding process blends Emhart's drawn arc stud welding technology with our experience in manufacturing weld nuts. This process automatically feeds and welds nuts by using a robot, fixed automation, or a manual hand tool. System components include a TMP welder control, a weld head, and a feeding system.

The TMP welder control also is used with Emhart's drawn are stud welding systems. The TMP's five outputs can be used to weld any combination of nuts and studs. TMP features a switching mode power supply controlled by microprocessor technology, enabling the unit to regulate and control even the shortest weld cycles. Any variations in weld circuit resistance and are voltage due to oily work surfaces are instantly compensated for via the weld power source. Also, the monitoring system can interface directly with a PC for easy data transfer.

Drawn Are Nut Welding uses the same head and gun designs as our stud welding systems, but with a modified front end. Styles include Linear Motor Weld Heads, Clutch Weld Heads, and/or Handheld Weld Guns. The modified front end of these units has a pin that protrudes through the nut during the welding process to protect threads against weld splatter.

The feeding system for Drawn Are Nut Welding uses a rotary bowl to orient the nuts properly to blow feed each nut directly to the weld head, thus maintaining proper orientation.

Specifications

Mounting .................Freestanding
Input Power ...............480 VAC +10%, 3-phase
Power Supply .............High-frequency switching
Weld Current..............200 to 1800 amperes
Pilot Arc Time.............30 to 100 milliseconds
Construction ..............Modular
Weld Process ..............Drawn arc
I/O (interface) ..........24 VDC (120 VAC capable)
Weld Time ..................6 to 100 milliseconds

Features

• Easily programmed
• Self diagnostic capabilities
• 5-outlet capability; 63 weld schedules per outlet
• Weld parameter monitoring
• Written alert and fault-output displays
• 16 x 40 digit liquid display programming pendant
• Modular construction
• Automatic feeding
• PC data interchange capability
• Closed-loop control of pilot-arc and main-arc currents
• Microprocessor-based control and data communications
• Weld power output tolerant of input voltage fluctuations
• Fiber-optic interface between feeder and TMP control

Benefits

• One-sided welding
• Flexible controller can do stud welding and nut welding
• Automatic compensation for head wear and oily base metal
• No pressure required for welding
• Weld zone around the entire circumference of the nut
• Cost of nut typically lower than projection weld nut