HWASHI WL-PJ-25K High Precision Projection Spot Welding Machine Proportional Valve Control for Precision Sheet Metal Assembly Product Overview HWASHI WL-PJ-25K high precision projection spot welding machine with proportional valve force control for precision sheet metal assembly. Multi-stage pressure profiles ensure optimal projection collapse and consistent weld nugget formation. Key Features Precision Engineering: Advanced Proportional Valve PID system ensures consistent