APS Welding presents the Arc Welding Machine 400A, a powerful and rugged solution built for industrial reliability. The Discover 400 Arc Welding Machine 400A features advanced IGBT Module-based 20kHz Full Bridge Inverter technology, delivering stable and precise welds across diverse applications—from production lines to construction sites.
Engineered for performance, this Arc Welding Machine 400A offers a robust 400 Amp output at a 60% duty cycle, ensuring efficiency even under continuous load. Compatible with a wide input voltage range (330–500V), it’s perfect for industrial settings with inconsistent power supply.
With a compact metal body weighing just 29kg and IP23-rated for protection, this machine stands up to dust, water, and harsh environments. It supports electrode sizes from 1.6mm to 5.0mm and is ideal for welding steel, stainless steel, and carbon steel.
Choose APS Welding’s Arc Welding Machine 400A for long-lasting performance, portability, and heavy-duty usage—trusted across workshops and job sites worldwide.
TECHNOLOGY:
IGBT Module-based 20KHz Full Bridge Inverter Technology:
The Discover 400 Arc uses IGBT (Insulated Gate Bipolar Transistor) Module technology, providing superior control over the welding process. This technology allows for higher power handling, faster switching speeds, and enhanced efficiency.
The 20KHz Full Bridge Inverter design ensures smooth, stable arcs and minimizes power loss, contributing to cleaner, more precise welds. This also means the machine operates more efficiently, generating less heat and improving overall durability.
TOP FEATURES:
High Output Power:
Delivers up to 400 amps at a 60% duty cycle and 300 amps at a 100% duty cycle, ensuring the power needed for even the most demanding welding jobs.
Wide Input Voltage Range:
With a voltage range from 330VAC to 500VAC, the Discover 400 Arc is capable of operating effectively across various power supply conditions, making it a versatile choice for different work environments.
Heavy-Duty Design:
Built for industrial applications, this rugged machine is ideal for heavy-duty tasks. Its metal body provides strength and protection against harsh conditions, and it is designed to withstand the rigors of continuous-duty cycle use.
Portability:
Despite its 29kg weight, the Discover 400 Arc is designed for easy transport. With rubber feet and a lifting handle, it can be moved from job to job with minimal hassle.
Durability:
Featuring an IP23 ingress protection rating, the Discover 400 Arc is resistant to dust and water, making it ideal for construction sites and other challenging environments.
Electrode Compatibility:
Supports various electrodes including 6013, 7018, in diameters ranging from 1.6mm to 5.0mm, allowing the machine to handle a wide range of welding materials and job thicknesses.
Efficient Cooling:
The forced air cooling system helps maintain optimal performance during prolonged use, ensuring the machine remains cool even during extended welding operations.
QUICK SPECS
PROCESS:
SMAW – Stick Welder, DC Constant Current Power Source.
NOTE: Continuous development entitles us to change specifications without notice. Pictures are for reference only.
The Discover 400 ARC supports a full range of SMAW electrodes — from fine repair work at 1.6mm to heavy structural passes at 5.0mm:
| Input Specifications | |
|---|---|
| Input Voltage | 415 VAC, 3-Phase, 50/60 Hz |
| Voltage Range | 330 VAC – 500 VAC |
| Input KVA @ 400A | 17.8 KVA |
| Input Cable | 4-core 2.5 sqmm, 4 meters |
| Switching Device | IGBT Module |
| Inverter Frequency | 20 kHz Full Bridge |
| Output Specifications | |
| Output Current Range | 10A – 400A |
| Output @ 60% Duty | 400 Amps |
| Output @ 100% Duty | 300 Amps |
| Open Circuit Voltage | 85 VDC (max) |
| Welding Process | SMAW – DC Constant Current |
| Polarity | DC+ / DC− |
| Protection & Insulation | |
| Ingress Protection | IP23 |
| Insulation Class | Class H (180°C) |
| Cooling Method | Forced Air (Fan Cooled) |
| Thermal Protection | Auto Thermal Cutout |
| Mechanical Specifications | |
| Dimensions (L×W×H) | 540 × 310 × 470 mm |
| Weight | 29 kg |
| Body | Full Metal |
| Base | Rubber Foot |
| Lifting | Integrated Handle |
| * Specifications subject to change without notice. Contact APS Welding for latest data sheet. | |
The Discover 400 ARC supports a full range of SMAW electrodes — from fine repair work at 1.6mm to heavy structural passes at 5.0mm:
| Electrode Type | Diameter Range | Material | Typical Application | Recommended Current |
|---|---|---|---|---|
| E6013 | 1.6mm – 3.15mm | Mild Steel | General fabrication, sheet metal, light structural | 40A – 130A |
| E7018 | 2.5mm – 5.0mm | Mild / Structural Steel | Heavy structural, pressure vessels, load-bearing joints | 80A – 220A |
| E308L / E316L | 2.5mm – 4.0mm | Stainless Steel | SS fabrication, food equipment, chemical industry | 70A – 180A |
| Carbon Steel | 3.15mm – 5.0mm | Carbon Steel | Heavy engineering, machinery frames, earth-moving equipment | 120A – 250A |
The Discover 400 ARC is a 3-phase industrial machine — it is not a general-purpose or entry-level welder. Understanding where it excels (and where it doesn’t) helps buyers make the right call.
APS Welding’s Discover Series offers SMAW machines across different output ratings. Here is a quick comparison to help select the right model:
| Specification | Discover 200EX | Discover 400 ARC ★ |
|---|---|---|
| Input Phase | Single Phase (230V) | 3 Phase (415V) |
| Output @ 60% Duty | 200 Amps | 400 Amps |
| Output @ 100% Duty | 130 Amps | 300 Amps |
| Max Electrode Size | 3.15 mm | 5.0 mm |
| Max Job Thickness | 6 mm | 25 mm |
| Weight | 7.2 kg (portable) | 29 kg (industrial) |
| Ingress Protection | IP21 | IP23 |
| Voltage Range | 150V – 300V | 330V – 500V |
| Best For | DIY, light fab, site repair | Heavy industrial production |
The Discover 400 ARC’s combination of 400A output, wide voltage tolerance, and IP23 site protection makes it the preferred stick welder across these industrial sectors:
🏗️ Bridge & Pipeline Construction
🏭 Heavy Engineering & Machinery
🛢️ Pressure Vessel & Boiler Welding
🚧 Infrastructure & Construction Sites
Industrial Maintenance & Repair
🚛 Earth-Moving Equipment Fabricatio
⚙️ Equipment & Component Manufacturing
🏗️ Structural Steel Fabrication
The 330–500V wide input voltage range makes it particularly well-suited for <strong>construction sites in India</strong> where DG set or generator power is the primary supply — a common challenge for heavy infrastructure projects.
Full 400 Amps at 60% duty cycle — handles 5.0mm electrodes and 25mm plate thickness for demanding industrial jobS.
Full 400 Amps at 60% duty cycle — handles 5.0mm electrodes and 25mm plate thickness for demanding industrial jobS.
Rated for dust and water splash resistance — performs in workshops, open yards, and outdoor construction environments.
APS Welding’s certified facility in Valsad, Gujarat — quality-controlled production, Made in India.
Nationwide service network, spare parts availability, and dedicated technical support team.
20kHz full bridge inverter delivers stable arc at 85%+ efficiency — lower power bills and less heat vs transformer-based machines
| Accessory | Model | Specification | Link |
|---|---|---|---|
| Electrode Holder | EH40 | 400A rated, heavy-duty insulated grip | View EH40 → |
| Earthing Clamp | EC40 | 400A rated, strong spring-jaw design | View EC40 → |
| Welding Cable | 35 sqmm | Heavy-duty flexible copper cable for 400A operation | View Cables → |
| Certification / Compliance | Scope | Relevance |
|---|---|---|
| ISO 9001:2015 | Complete manufacturing facility — Valsad, Gujarat | Quality-controlled production, consistent output standards |
| IS Certified | Applicable Indian Standards for welding equipment | Compliance with BIS standards for Indian market |
| MSME Registered | Advanced Power Sources Limited | Registered Indian manufacturer — supports domestic procurement requirements |
| CE Compliance | Available for applicable export models | European conformity — available on request for export buyers |
Looking for complete welding solutions? Explore our advanced welding machines and accessories:
Discover 400 ARC is a 400 Amp Stick Arc Welding (SMAW) machine designed for heavy fabrication and industrial welding applications.
Yes. The machine is built for heavy-duty fabrication, structural welding, and regular industrial workshop operations.
Discover 400 ARC is suitable for welding mild steel and structural steel materials commonly used in fabrication and industrial work.
The machine supports regular and extended welding operations. For extreme 24×7 high-load usage, duty cycle management is recommended.
Discover 400 ARC is manufactured at APS Welding’s ISO 9001:2015 certified and MSME registered facility. CE compliance is available for applicable export models.
APS Welding provides technical support, spare parts availability, and service assistance for Discover 400 ARC.
APS welding is always ready to help you. For Sales Enquiries:Contact: +91 9601 444 111For booking service call:Contact: +91 9601 444 222
We design and manufacture all our products and thus we know the best about our products.
We are able to offer international technology and service at optimum prices.
Our team is regularly trained for updates in service techniques and also are constantly update on knowledge and skill.
We ensure you professionally managed sales and after sales support.
Office & Manufacturing Facility:
Survey No 172/1, Paikee 2, OLD GIDC Gundlav, Valsad, Valsad District, GUJARAT – 396035. INDIA.