PLC Control Multi Head Spot Welding Machine The PLC controlled multi head spot welding machine is built for door panels up to 3+3mm welding thickness. Multiple heads weld simultaneously with firm quality, and the automatic PLC cycle requires only one operator, significantly reducing labor cost. Key Features - Firm Welding & Labor Cost Reduction Multi head simultaneous welding for high production speed Firm welding quality on 3+3mm steel door panels PLC automatic cycle, one