Dishwasher Inner Tank Automatic Seam Welding Machine
Product Overview
The Hwashi Dishwasher Inner Tank Automatic Seam Welding Machine is a specialized resistance welding system designed for the production of dishwasher interior cavities and similar hollow stainless steel containers. This machine produces high-quality, leak-proof seam welds essential for appliance manufacturers where hygiene, durability, and corrosion resistance are non-negotiable requirements.
The machine supports three distinct seam welding modes — continuous, intermittent (stitch), and step — each optimized for different production requirements and material characteristics. This versatility makes it equally suitable for high-speed production lines requiring hermetic seals and for applications demanding minimal heat input to preserve critical surface finishes.
Built with a heavy-duty steel frame and precision-machined rolling electrodes, the machine handles the repetitive high-volume production demands of the appliance industry. The water-cooled electrode system ensures consistent performance during extended shifts, while the PLC-based control interface enables operators to switch between modes and adjust parameters with minimal training.
Key Features & Benefits
1. Three Seam Welding Modes — Optimized for Every Application
Continuous Seam Welding
- Both the workpiece and rolling electrodes move continuously
- Steady welding current applied throughout the seam
- Best for: hermetic seals, pressure-tight containers, smooth cosmetic welds
- Produces a continuous fused line — ideal for dishwasher tanks requiring complete water-tightness
Intermittent (Stitch) Seam Welding
- Rolling electrodes rotate continuously while workpiece moves
- Welding current pulses on and off — forms discrete overlapping nuggets
- Reduced heat input — minimizes thermal distortion and discoloration
- Best for: thin-gauge materials, decorative panels, applications sensitive to heat
Step Seam Welding
- Rolling electrodes move in controlled increments
- Current applied only when electrodes and workpiece are stationary
- Maximum electrode cooling and pressure consolidation between spots
- Best for: thick materials (2.0mm+), high-strength structural joints, materials requiring minimal heat-affected zone
2. Water-Cooled Rolling Electrode System
- Precision-machined copper alloy rollers — excellent electrical conductivity and wear resistance
- Built-in water cooling — maintains optimal electrode temperature during continuous operation
- Spring-loaded electrode arm — maintains consistent contact pressure throughout seam length
- Quick-change electrode adapters — fast tooling changeover between product models
3. Medium-Frequency DC Inverter Power Source
- 1000Hz output frequency — pure DC output eliminates arc wander and improves nugget consistency
- Precise current regulation — adjustable welding current to ±1% accuracy
- High power factor (>0.95) — energy efficient with lower operating costs
- No voltage dip on the power grid — safe to operate alongside sensitive test equipment
4. PLC Touch-Screen Control Interface
- Mode selection — easily switch between continuous, intermittent, and step welding
- Parameter programming — set current, speed, pulse timing, and electrode pressure
- Production monitoring — weld count, cycle time, fault diagnostics
- Product memory — store up to 100 different product programs for quick recall
5. Designed for Appliance Production Lines
- Automatic loading/unloading compatibility — integrates with automated material handling systems
- High duty cycle — built for 24/7 production environments
- Low maintenance design — simple daily maintenance procedures, minimal consumables
- Safety features — emergency stop, light curtains, protective interlocks
Technical Specifications
| Parameter | Specification |
|---|
| Model | WL-SW Series |
| Power Supply | AC 380V / 50Hz, 3-phase |
| Rated Capacity | 75–150 KVA (model dependent) |
| Output Frequency | 1000Hz (Medium Frequency DC) |
| Max Short-Circuit Current | 30,000–45,000A (model dependent) |
| Welding Speed | 0.3–3 m/min (adjustable) |
| Material Thickness | 0.5–2.5mm (stainless steel, carbon steel) |
| Seam Length | Up to 1500mm (customizable) |
| Electrode Type | Water-cooled copper alloy rollers (Ø80–120mm) |
| Welding Modes | Continuous / Intermittent / Step (selectable) |
| Control System | PLC + Touch Screen HMI |
| Cooling System | Water cooling (built-in circulation) |
| Dimensions | 2000×1800×1600mm (standard) |
| Weight | 1,200–1,800 kg |
