Product Specification

7 Head Multi Point Projection Welding Machine for Fuel Tank Production

Product Overview

This 7-head projection welding machine is purpose-built for high-volume fuel tank production lines, delivering simultaneous multi-point resistance welding with consistent fusion quality. By integrating seven fixed convex points into a single annular electrode assembly, the system guarantees uniform pressure distribution across every weld point, eliminating the strength deviations commonly found in conventional spot welding setups.

Engineered for batch manufacturing of fuel tank shells and metal ring assemblies, the machine combines a shared transformer secondary circuit, four-stage timing control, and a forced water cooling loop to maintain stable output and extend electrode service life. The built-in slow-start and voltage stabilization functions protect weld energy from grid fluctuations, ensuring repeatable sealing and structural integrity across every production run.

Key Technical Advantages

Precision Machined 7-Point Annular Electrode

The upper and lower annular electrode rings each carry seven fixed convex points formed as one integrated structure. Convex point positions are guaranteed by machining accuracy rather than manual adjustment, so every weld point receives identical clamping force after electrode alignment.

Balanced Current Distribution

All seven weld points share the same transformer secondary circuit and are energized simultaneously. Current is evenly routed to each bump through soft copper strips, producing consistent heat input and uniform nugget height across the full weld ring.

Four-Stage Timing with Holding Phase

Independent adjustment of pressurization, welding, holding, and rest stages allows the molten core to fully crystallize before electrode release. This dedicated holding phase effectively prevents shrinkage, porosity, and microcracks while improving joint density and tensile strength.

Forced Water Cooling System

A continuous water channel runs through the annular electrode ring, removing heat at the root of each convex point. This keeps electrode temperature within a safe operating range, reducing splashing and preserving a smooth, clean weld surface appearance.

Voltage Stabilization for Production Reliability

The built-in slow-start and voltage stabilization functions suppress the impact of grid voltage fluctuations on welding energy. Output current remains constant even during peak factory power demand, ensuring stable weld quality for every metal ring in mass production.

Applications

Working Principle

Technical Specifications

After-Sales and Support

• Warranty — 12-month warranty on core machine components including transformer, control system, and pneumatic units (wear parts excluded).
• Installation & Training — Field installation, commissioning, and operator training available at your site to get production running quickly.
• Technical Support — Video-based technical guidance and online Q&A support during and after the warranty period.
• Spare Parts Supply — Rapid delivery of spare parts including annular electrodes, sealing rings, and waterway components to minimize downtime.
• Documentation — Complete training videos, operation manual, and maintenance instructions included with each machine.

Frequently Asked Questions

What materials can this machine weld?

The projection welder handles carbon steel, alloy metal, aluminum, and stainless steel sheet combinations. For fuel tank applications, it reliably joins the tank shell to the metal mounting ring with consistent sealing and joint strength.

How many weld points are produced per cycle?

Seven weld points are created simultaneously in a single press cycle. The 7-head annular electrode design ensures each point receives identical pressure and current, producing uniform fusion cores across the entire ring.

Can the machine be customized for different fuel tank sizes?

Yes. The annular electrode assemblies are quick-change components designed to be swapped for different tank specifications. Our engineering team also offers custom electrode design and free sample welding to verify the solution before purchase.

What power supply options are available?

Primary voltage options include 220V, 380V, and 440V, with rated frequency of 50/60Hz. Please specify your local power standard when requesting a quote so the transformer can be configured accordingly.

How does the cooling system protect weld quality?

Forced water cooling circulates continuously through the annular electrode, removing heat at the convex point roots. This prevents electrode overheating, reduces splashing, and keeps the weld surface smooth and clean even during continuous batch production.

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