AVP360 / AVP500 AC/DC Pulse TIG Welder

OTC DAIHEN AVP360 / AVP500 Dual Inverter AC/DC Pulse TIG Welding Power Source In-Depth Technical Analysis

The OTC DAIHEN AVP Series (AVP360 / AVP500) stands as a landmark equipment series in the evolution of TIG welding for metal fabrication. It breakthrough utilizes “Dual Inverter High-Speed Control Technology” to output an exceptionally perfect “ideal rectangular wave” AC current. This grants the equipment unmatched cathodic cleaning action and arc stability when welding readily oxidized materials such as aluminum and magnesium alloys. Offering a broad pulse frequency spectrum (0.5Hz–500Hz) and multi-waveform switching, the AVP series served as the primary arc power source in aerospace, rail transit aluminum carriages, and premium medical device manufacturing.

🌟 Core Technical Heritage & Classic Process Selling Points

• Dual Inverter Matrix & Ideal Rectangular Wave: Independently controlling positive and negative half-waves via dual inverter circuits produces an AC rectangular waveform with near-zero transition time. The arc is exceptionally stiff and directional, permanently eliminating traditional AC TIG arc outages and rapid tungsten electrode consumption.
• All-Terrain Waveform Library: Integrates a versatile waveform selection including AC sine wave for quiet, smooth welding, AC rectangular wave for deep penetration, pure DC wave, and AC/DC hybrid wave (MIX TIG) engineered for joining dissimilar thicknesses.
• Full-Spectrum Pulse Arc Modulation: Provides 0.5–15Hz low-frequency pulsation (perfect for thin-sheet heat input control and aesthetic fish-scale bead formation) alongside 10–500Hz mid-frequency pulsation (compressing arc density for enhanced thick-plate penetration), covering 0.5mm thin sheets up to 20mm heavy plates.
• Integrated Heavy Water-Cooling System: The AVP500 comes standard with high-capacity recirculating water cooling and the flagship AW-12 water-cooled torch, ensuring reliable thermal dissipation under 500A extreme current output.

🏭 Classic Industrial Applications & Process Scope

• Aerospace & Defense Manufacturing: Flawless precision cavity welding of titanium and magnesium alloys demanding stringent heat input and shielding gas control.
• Rail Transit Aluminum Carriages: Heavy-current AC TIG deep-penetration root and capping passes on side walls and underframes of high-speed train aluminum bodies.
• Specialized Heat Exchangers & Chemical Piping: High-quality pulsed TIG single-sided welding with double-sided bead formation on thin-wall stainless steel piping and duplex vessel assemblies.

📋 AVP360 / AVP500 Core Technical Specifications Historical Archives

Below is the detailed electrical, physical parameter, and standard configuration table for both classic models, rigorously unit-decoupled (strictly adhering to historical factory archives):

Specification Category		Unit	AVP-360	AVP-500
Input Grid Voltage & Frequency		V, Hz	Three-phase, 380V±10%, 50/60 Hz
Rated Total Input Capacity (TIG Mode)		kVA (kW)	16.4 (12.8 kW)	25.7 (20.0 kW)
Output Current Adjustment Range	AC TIG Mode	A	10 ～ 360	20 ～ 500
	DC TIG Mode		4 ～ 360	5 ～ 500
Rated Duty Cycle (Load Factor)		%	25%	60%
External Dimensions (W×D×H)		mm	376 × 649 × 731	508 × 724 × 895
Power Source Net Weight		kg	83	133
Official Standard Configuration Kits (Maintenance Ordering Reference)	Matching Standard Torch	–	AW-18 (Water-Cooled)	AW-12 (Water-Cooled)
	Shielding Gas Flow Regulator	–	AF-2502
	Combined Cable Bundle	–	BAB-3501	BMRH-5001

🔧 AVP Legacy AC/DC TIG Welder Maintenance & Troubleshooting Guide

• Dust Vulnerability of Dual Inverter Motherboards: AVP series power sources house highly complex AC/DC dual-path IGBT inverter motherboards with extreme electronic component density. After 5+ years in service, airborne metallic dust adheres to circuit boards, risking high-voltage creepage short circuits. Maintenance personnel must open the top cover every 3 to 6 months and use low-pressure dry compressed air (≤0.1MPa) to blow out cooling channels and check main fan RPM.
• High-Frequency (HF) Arc Starter Spark Gap Calibration: Legacy TIG welders generate high-frequency, high-voltage ignition pulses across tungsten spark gap discharge contacts. Over prolonged service, contact points suffer electrical spark erosion, resulting in hard ignition or wandering arcs. Never replace the motherboard prematurely! Let a certified electrician disconnect power, dress the tungsten contacts, and re-calibrate the spark gap to 0.8–1.0mm using a feeler gauge per factory specifications.
• Anti-Freezing Rule for AW-18/AW-12 Water-Cooling Systems: Standard AW-18 and AW-12 torches are heavy-duty water-cooled models containing delicate internal nylon coolant tubes. Never use tap water in the cooler (calcium scaling clogs water cables)! In sub-freezing winter regions, always drain internal torch water or inject OTC dedicated antifreeze during shutdowns; frozen, cracked water lines will be punctured by HF ignition voltage, ruining expensive torch assemblies.