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Project Introduction: Double‑Head Energy‑Storage Welding Machine

Aug 20,2026

In automotive component manufacturing, projection welding of bolts and nuts is a fundamental core procedure for component assembly. For workpieces requiring symmetric‑point, double‑sided bolt‑and‑nut welding, conventional single‑head welding machines demand repeated clamping and multi‑pass welding. The process is cumbersome and may trigger such problems as uneven workpiece heating, forming deviation, inconsistent spot‑weld strength, workpiece deformation, cold joints and weak welds.

The Haifei double‑head energy‑storage welding machine fits various working conditions for symmetric‑point bolt and nut welding. Adopting a dual‑head synchronous‑welding structure and capacitive energy‑storage instant‑energy‑release process, it completes double‑sided simultaneous welding in one pass. It features low heat‑affected zones, uniform and firm weld spots and low energy consumption.

I Customer Background & Production Pain Points

The customer specializes in manufacturing automotive structural parts, household‑hardware components and general sheet‑metal parts.

Pain points of original welding processes:

1.Conventional single‑head machines require multiple clamping operations and multi‑pass welding, resulting in cumbersome workflows, slow production rhythm and high labor input.

2.Multi‑pass welding causes uneven heating and unbalanced stress on both sides of workpieces, easily leading to sheet‑metal warping and point‑position offset.

3.Conventional equipment delivers unstable energy output with high energy loss. Weld‑spot penetration is uneven; batch‑to‑batch quality varies, and cold joints & weak welds frequently occur.

4.Repeated manual positioning leads to inconsistent reference benchmarks and obvious forming differences between double‑sided weld spots.

5.Conventional equipment offers poor process solidification; parameters have no systematic storage. Quality heavily depends on operator debugging experience and production data cannot be traced.

II Customer Requirements

1.Adopt dual‑head synchronous‑welding structure to finish double‑sided spot simultaneous fusion in one clamping cycle and improve welding efficiency.

2.Optimize energy‑storage welding process to shorten heating duration, balance workpiece thermal conditions and reduce sheet‑metal deformation and point‑position deviation.

3.Stabilize equipment energy and pressure output, mitigate uneven weld‑spot penetration, and enhance overall weld‑spot strength and batch consistency.

4.Optimize equipment energy‑consumption structure to lower grid load and ineffective energy loss and cut production costs.

5.Support storage & quick switching of process parameters for multi‑specification workpieces to realize flexible multi‑variant production; process data shall be storable and traceable.

III Custom R&D Solutions

Targeting customer requirements, the specialized R&D team repeatedly optimized schemes to resolve drawbacks of traditional single‑head bolt‑nut welding: low efficiency, poor symmetry and high energy consumption.

1.Process Verification: Conduct multiple groups of welding tests for bolt‑nut workpieces of different plate thicknesses and specifications; optimize core parameters including double‑sided synchronous pressure, energy‑storage energy, discharge duration and pressure‑hold cooling.

2.Equipment Selection: Deploy Haifei double‑head energy‑storage welding machine. Its dual‑head synchronous‑welding architecture realizes synchronous and balanced pressure application & discharge timing on both sides. Workpieces obtain even heating, relieving deformation, offset and inconsistent forming caused by multi‑pass welding. Equipped with capacitive energy‑storage welding power source, it accomplishes fusion by instant energy release. Heat‑affected zones are small, workpieces resist deformation, surface finish is neat and weld spots are full and solid.

3.Structural Design: Dual‑heads run smoothly with precise positioning and stable long‑term performance. Balanced pressure‑stabilizing pressing structure guarantees firm workpiece clamping and unified clamping benchmarks. Custom adjustable universal tooling supports rapid production change‑over for multiple bolt‑nut specifications.

4.Core Advantages

High Efficiency: Double‑spot welding, simplified workflows.

Stable Quality: Uniform weld spots, low deformation.

Low Energy Consumption: Energy‑saving, wide adaptability.

IV Delivery, After‑Sales & Customer Feedback

Pre‑acceptance and on‑site equipment inspection were completed. Continuous trial operation yields stable welding pass rate. After commissioning, all original production pain points are fully resolved. Timely, professional and thoughtful after‑sales service wins high customer recognition.

V Haifei Corporate Mission

Meeting customers’ customized welding demands is Haifei’s core mission. We adhere to the philosophy “Create Value for Customers”. Everything starts from your practical welding requirements: whether you need standalone automatic machines, integrated workstations or complete production lines, please share your demands, and Haifei will conduct targeted R&D and customization for you.