Automatic Nut Projection Welding Workstation

Automatic Nut Projection Welding Workstation: M10 Weld Nuts Joined Every 6.5 Seconds

Application story · Automated nut welding for automotive parts and sheet metal components
Vibratory bowl feeding, robot pick-and-place, projection welding, air-blow cleaning and weld inspection run in one fenced cell - with a finished product rate of 99.99% and one operator watching 2 to 3 workstations.

The complete workstation: safety fence, nut feeding, robot handling and welding in one cell

Nut Feeding Runs By Itself
The shift starts with a full vibratory bowl feeder. Weld nuts are oriented and conveyed automatically, so the station keeps welding for at least an hour before the next refill - no operator placing nuts on the electrode by hand.
A handling robot picks up the stamped workpiece and moves it to the welding position. Positioning repeats to the same point every cycle, so nut placement stays consistent from the first part to the last.

One Welded Part Every 6.5 Seconds
Inside the cell, the medium-frequency DC power source joins the M10 projection weld nut to the part. The discharge time is short and the current rise is fast, which keeps the weld nugget at about 0.2 mm depth: the sheet is fused, but the nut thread is left undamaged - no deformation, no burn-through, and no re-tapping after welding.
The station completes one welded part approximately every 6.5 seconds. With automatic unloading after welding, the finished parts leave the cell without anyone stepping inside.

Welding head: the pressing cylinder holds the nut in place while the copper electrode carries the welding current

The workstation from the aisle side - feeding, welding and unloading all inside the fence

Quality Is Built Into the Cycle
Every weld is counted. If a nut is missing or welded in the wrong position, the equipment alarms automatically and the defective part is stopped before the next process.
After each weld, a blow-clean function on the electrodes and fixtures removes welding debris from the nut thread, and the weld inspection function checks the result in the same cycle. A PLC control system with network bus control and fault diagnosis keeps the whole process traceable, and the station can be connected to the MES system.

Weld sample: M10 projection weld nut on a stamped bracket - thread undamaged, no re-tapping

The result: a finished product rate of 99.99% or above, with stable quality that does not depend on operator skill. One operator refills nuts about once per hour and can supervise 2 to 3 workstations at the same time.

On The Production Floor
The cell is fenced on every working side, with the feeding stations reachable from outside the fence and the control panel and air preparation unit mounted outside - the operator never has to open the gate during a running shift.
Because the feeder, the weld power source and the inspection system sit in one frame, the workstation can be dropped into an existing line without rebuilding the process around it.

Feeding section and control panel at the fence door

Front view: full guarding on the working sides, feeding stations behind the mesh

Feeding stations along the line - each station carries its own bowl feeder and part chute

Key Specifications

Where It Welds

• Automotive parts: brackets, clips, mounting plates, seat components
• Sheet metal parts: cabinet panels, chassis parts, support plates
• Home appliance hardware: back plates, mounting brackets
• Furniture and shelving hardware: angle brackets, connecting plates
• Construction hardware: strut channel fittings, anchor plates

Custom fixtures and electrode tooling are designed to the customer's real part drawings or samples - send us your part and we run welding samples before you order.

Talk to Pudian Technology
Guangdong Pudian Automation Technology Co., Ltd builds custom welding automation in-house: fixtures, electrode tooling, feeding, robot handling, welding and inspection - one team, one solution.