When sourcing for B2B applications, prioritize machines with IGBT Inverter Technology for better energy efficiency and arc stability. Key specs include the Duty Cycle (aim for at least 60% at maximum amperage for industrial tasks), Amperage Range (e.g., 10-200A or 10-400A depending on material thickness), and High-Frequency (HF) Start to ensure clean arc ignition without tungsten contamination. Additionally, look for Pulse TIG functions which allow for superior heat control, especially when welding thin stainless steel or aluminum.