Hwashi Automatic Seam Welding Machine for High-Strength Joints with Adjustable Welding Wheel Speed and 360° Rotational Capability

The Hwashi Stainless Steel Kitchen Utensil Sink Bowl Seam Welding Machine is a specialized automated solution engineered to deliver flawless, high-strength seams for stainless steel sink bowls—critical components in kitchen utensil manufacturing. Designed to address the unique challenges of welding thin-gauge stainless steel (0.8-2mm thickness), this machine combines precision engineering with intelligent control to redefine seam quality and production efficiency.

At its core is the advanced seam welding technology, which utilizes high-frequency resistance welding (HFW) paired with a servo-driven welding wheel system. This ensures uniform heat distribution along the sink bowl's curved or straight seams, creating airtight, leakproof joints with a smooth, post-weld surface finish (Ra ≤ 0.8μm)—eliminating the need for time-consuming manual grinding or polishing. The machine's adaptive current control adjusts welding parameters in real time based on material variations (304/316 stainless steel) and seam length, guaranteeing consistent weld strength (shear strength ≥ 300MPa) that meets food-grade safety standards (FDA, LFGB).

Tailored for sink bowl geometries, the machine features a customizable clamping fixture with 360° rotational capability, accommodating various sink designs—from single-bowl to double-bowl configurations, deep or shallow profiles, and even sinks with integrated drain grooves. The fixture's precision positioning (±0.05mm repeatability) ensures seamless alignment of sink components before welding, minimizing gaps that could lead to weak points or leakage.

Seam welding is a form of permanent metal welding. When welding, welding pressure between two spinning welding wheels drives the weldment and electricity, with welding current causing local heating. This forms successively overlapping welds to create continuous weld joints for permanent bonding. Applications include automotive and motorcycle fuel tank casings, barrels such as cans, and sheet-formed artifacts like wheels, mufflers, and radiators.

The machine adopts 75KVA/100K medium frequency inverter DC power source with a 50% duty cycle rate and 26KA welding output current. The three-phase power supply is rectified by a special inverter, converted into 1000Hz AC voltage, then transmitted to a medium frequency transformer where the current is rectified to supply DC welding current.