Product Specification

High Force Capacitor Discharge Energy Storage Projection Welding System for Stud Nut Bolt Spot Welding

Product Overview

This heavy-duty capacitor discharge energy storage projection welder is purpose-built for manufacturers seeking repeatable, high-integrity metal joints on stainless steel fasteners such as studs, nuts, and bolts. Unlike conventional AC welders that depend on utility grid stability, this unit banks energy in capacitor modules and releases it in a controlled, instantaneous pulse. The result is consistently strong nuggets with minimal heat-affected zone, even when the incoming line voltage fluctuates. With a chassis weighing 2000 kg, the machine absorbs reaction forces and maintains electrode alignment through rapid, continuous duty cycles, which makes it a practical foundation for automated fastener welding cells or high-throughput manual lines.

From a procurement standpoint, the equipment delivers value well beyond its purchase price. The capacitor discharge method reduces electrode wear and lowers overall energy draw, while the automatic welding cycle removes operator-dependent variables such as hold time and trigger force. Production managers gain predictable output rates, quality inspectors see a tighter spread in peel-test results, and maintenance teams benefit from a simplified electrical architecture with fewer contactors and transformers under load. Whether your shop handles automotive brackets, appliance sub-assemblies, or specialty stainless fasteners, this projection welder is configured to improve first-pass yield and lower per-part cost.

Key Technical Advantages

Stored-Energy Discharge for Weld-to-Weld Uniformity

Each weld draws from fully charged capacitors, meaning the energy delivered is predetermined and identical across every cycle. This removes the common defect of cold welds or expelled metal that appears when shop voltage sags during peak load periods, giving quality teams a stable process window.

2000 kg Frame with Reduced Deflection

The reinforced box-style frame and rigid guide columns keep upper and lower electrodes parallel under full clamping force. Thicker materials and larger fasteners no longer cause frame spring-back, which directly translates into symmetrical weld nuggets and extended tooling life.

Lower Consumable Cost and Higher Uptime

Because peak current is delivered in milliseconds rather than sustained over many cycles, copper electrodes experience less localized heating and pitting. Shops routinely report fewer dressing stops and longer intervals between electrode replacement, lowering both consumable spend and line stoppages.

Automatic Cycle Engineered for Production Discipline

The machine follows a fixed sequence: load fastener, initiate cycle, apply force, discharge energy, and release. Every parameter—clamping pressure, weld energy, and cycle time—is locked by the controller, preventing operator error and allowing a semi-skilled worker to produce parts that meet certified weld schedules.

Adaptable Power Supply Options

The unit can be wired for 380V, 220V, or 440V three-phase input, making it straightforward to integrate into existing plant electrical layouts across different regions without additional transformation headaches.

Applications

Working Principle

Technical Specifications

After-Sales and Support

• Free Spare Parts — Consumable and wear items are shipped without charge during the warranty period, minimizing downtime when routine replacement is needed.
• Field Installation, Commissioning and Training — Our technician can supervise setup, perform trial welds on your production samples, and train operators on cycle programming and daily maintenance procedures.
• Online and Video Technical Support — For troubleshooting and parameter questions, remote assistance is available via video call, with our engineers responding through chat or screen-share sessions.
• 1 Year Warranty — The complete electrical and mechanical assembly is covered for twelve months from installation, offering peace of mind for your investment payback period.

Frequently Asked Questions

What types of fasteners and materials can this projection welder handle?

The machine is designed primarily for projection welding of stainless steel studs, nuts, and bolts onto sheet metal or formed parts. Conventional spot welding of similar alloys is also supported within the rated capacity range, and the controller allows fine adjustment of discharge energy to fit part thickness from roughly 3.0+3.0 mm up to 6.0+6.0 mm depending on the model selected.

How do I decide between the 100 KVA and 250 KVA models?

Begin with the combined thickness of your materials and the projected contact area of the fastener. If you are welding fasteners up to M8 on 3 mm sheet, the DN(B)-100 is sufficient. Larger flanges or thicker base metal require the clamping force and short-circuit current of the 200 or 250 KVA versions, which deliver up to 15000 N of electrode force.

Can this machine be integrated into an automated welding cell?

Yes. The welding cycle is triggered by a standard PLC-friendly signal, and the two optional nut conveyors shown in the detail images allow semi-automatic part feeding. Customers have also combined the welder with robotic loading arms by connecting to the machine’s external I/O for start and ready status.

What is the actual power consumption compared to an AC spot welder?

Because power is drawn from the grid over a charging window rather than during the weld instant, the peak demand on your supply line is substantially lower. This can reduce demand charges on your electricity bill and lessens the need for heavy-duty distribution upgrades in an existing plant.

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