Hwashi Automatic Roll-Round Seam Welding Machine for Woven Wire Mesh Filter Cartridges with Airtight Seams and 50% Fewer Processing Steps

One pass. Continuous seam. Zero leaks.

Hwashi's CNC Stainless Steel Sink Seam Welding Machine replaces traditional spot welding with precision roller seam welding technology — producing continuous, overlapping weld nuggets that create airtight, watertight seams on every sink. No pinhole leaks, no rework, no post-weld sealing required.

Powered by MFDC inverter technology and Mitsubishi CNC 3-axis servo control (X, Y, A), the machine automatically executes pre-programmed welding trajectories for single-bowl, double-bowl, and triple-bowl sinks in square, rectangular, or round configurations. Operators load and unload — the machine does the rest.

Why sink manufacturers choose this machine:

• 100% watertight seams — Overlapping weld nuggets exceed 1/3 nugget diameter overlap, guaranteeing hermetic seals
• 3-axis CNC automation — Mitsubishi servo system handles X/Y/A positioning; just input coordinates and current
• 95 welding programs — Store programs for every sink model, switch in seconds
• 360° R-corner welding — Servo-driven A-axis rotates welding wheel through any angle, including tight radii
• 30%+ energy savings — 2nd-gen MFDC power source vs. conventional AC
• ~40–60 sec/bowl — High-efficiency continuous production cycle

The machine uses continuous roller seam welding — two precision roller wheels apply pressure and MFDC current to the overlap seam of the sink body, creating a continuous row of overlapping weld nuggets:

1. Loading — Operator places sink bowl onto custom fixture on the moving table
2. Positioning — Table auto-moves to welding start position; CNC positions electrode
3. Welding — Roller wheel follows pre-programmed path, creating continuous sealed seam
4. Rotation — A-axis servo rotates wheel through R-corners and curves automatically
5. Return — Table returns to loading position; operator removes finished sink
6. Next cycle — Begins immediately with near-zero idle time

The entire welding path — straight edges, R-corners, transitions — is executed automatically from stored programs. No manual repositioning.

Japan Mitsubishi servo motors drive X-axis (table movement), Y-axis (electrode vertical travel), and A-axis (360° electrode rotation). Input coordinate data and welding current — the machine executes the complete welding path autonomously. Up to 95 programs stored for instant model changeover. Suitable for any welding angle including complex R-corners and tight radii.

2nd-generation MFDC power source delivers fast DC current rise, stable output, and minimal spatter. Three-phase balanced input prevents power grid impact. Current control accuracy ±1% ensures consistent weld quality across every sink. Overlapping nugget pattern produces continuous airtight seams — the defining advantage over spot welding.

Purpose-designed large flat copper platform provides stable, uniform conductivity across the entire sink surface. Ensures consistent current distribution and minimizes heat distortion on thin stainless steel (0.8–1.5mm). Custom fixtures designed per sink model for precise positioning.

A-axis servo enables full 360° rotation of the welding roller — seamlessly welds R-corners, straight edges, and curved profiles in a single uninterrupted pass. No manual repositioning. Produces uniform, aesthetically pleasing weld seams requiring minimal post-weld finishing.

Synchronized operation of welding electrodes and moving worktable via precision gear-rack transmission. X-axis travel ≥2,500mm for oversized sinks, Y-axis ≥750mm for full depth coverage, Z-axis ≥350mm for various sink heights. Smooth, repeatable positioning with low maintenance.

Closed-loop water cooling on transformer, SCR, and electrode assembly enables extended continuous operation without overheating. Stable weld quality maintained throughout long production runs. Low maintenance, long component service life.