Bisutime - Portable Industrial Arc Welding Machine - MMA-400

I. Product Overview

The MMA-400 is an IGBT module inverter-type DC manual welding machine (electrode welding machine). Built with fourth-generation full-bridge IGBT inverter power supply technology, it is designed for heavy-duty industrial welding operations. Featuring a portable blue-black chassis and top-mounted handle, it is a mainstream welding machine for construction steel structures, equipment maintenance, and hardware processing. It is compatible with a wide range of welding electrodes, including ordinary carbon steel, stainless steel, alloy steel, and cast iron.

II. Panel Function Zone Explanation

1. Control Components

CURRENT (Main Current Adjustment Knob): Stepless adjustment from 1 to 10 levels, precisely controlling the 20~400A output welding current. The digital display shows the current current value in real time. It is compatible with all electrode sizes from 2.5 to 6mm.

xxARC FORCE (Arc Force Knob):xx Adjustable thrust current from 1 to 10. Automatically increases current during short circuits to prevent electrode sticking and undercut. Suitable for low-hydrogen alkaline welding electrodes and high-current vertical/overhead welding scenarios.

xxIndicator Lights:xx

Green Power Indicator: Always on when the equipment is powered on.

Red Overheat Protection Indicator: Illuminates in case of overheating/overcurrent/undervoltage, automatically shutting down the machine for protection. Resumes operation after cooling.

xxDigital Ammeter (CURRENT METER):xx Provides real-time and accurate feedback of output current, avoiding errors caused by experience-based range adjustments.

xx2. Output Interfaces:xx Two all-copper quick-connect terminals (+/- positive and negative) on the lower left and right sides of the machine body, for connecting welding clamp wire and ground clamp cable respectively. Thickened copper posts prevent overheating and reduce conductivity loss, minimizing arcing and loose connections during high-current welding.

xx III. Core Product Advantages

1. IGBT Inverter Core Technology

Utilizing high-power IGBT power modules, the high inverter frequency reduces size and weight by 60% and saves over 30% on energy compared to older industrial frequency coil welding machines. It provides constant DC output current, stable arc, less spatter, and smooth, aesthetically pleasing weld formation.

2. Dual-Function Adjustable (Hot Start + Arc Force)

Built-in independent adjustment for both hot start and arc force: Automatically increases the arc current upon startup, allowing even beginners to easily initiate an arc without sticking the welding rod; instantly increases thrust during high-current welding and short-circuit welding, suitable for high-intensity intermittent welding and all-position pipe welding.

3. Comprehensive Intelligent Protection

Equipped with five-fold circuit protection: overvoltage, undervoltage, overcurrent, overheat, and reverse connection protection; stable operation within a 15% voltage fluctuation range; automatic power-off shutdown when overheating under full load prevents tube burnout and motherboard damage, maximizing durability in harsh construction site power grid environments.

4. Dustproof and Durable Chassis: The chassis is made of thickened cold-rolled steel plate with front and rear louvered convection air ducts and a high-power axial fan for forced air cooling for rapid heat dissipation. The internal circuit boards are insulated and sealed for dust and moisture protection, making them less prone to failure in dusty and humid conditions, such as construction sites. A one-piece rubber handle on the top allows for easy portability for single-person operation.

5. Wide Electrode Compatibility: Compatible with: ordinary J422 acidic carbon steel welding electrodes, J506/J507 alkaline low-hydrogen welding electrodes, stainless steel welding electrodes, and cast iron surfacing welding electrodes, covering all scenarios including building steel frames, agricultural machinery repair, steel structure workshops, and wrought iron processing.

IV. Key Electrical Parameters

Table Parameter Item Specification Value

Input Power Supply Three-phase 380V industrial voltage (some models support 220/380V dual voltage)

Rated Output Current 20A~400A continuously adjustable

Open-circuit Voltage 64~69V

Duty Cycle 60%@400A (40 environment), 100%@310A continuous long welding

Applicable Electrode Diameter 2.5/3.2/4.0/5.0/6.0mm all sizes

Overall Efficiency 85%, low no-load loss for greater energy saving

Insulation Class F Grade 1 Industrial Insulation Standard

V. Applicable Application Scenarios

Construction Engineering: Steel frame splicing in factories and buildings, scaffolding welding;

Equipment Repair: Repair of damaged frames in construction machinery, agricultural machinery, and trucks;

Hardware & Wrought Iron: Processing of railings, shelves, and wrought iron doors and windows;

Pipeline Installation: Welding of carbon steel water pipes and support pipes;

Field Repair: Temporary emergency repair work in mines and construction sites (stable welding can still be performed even with cables extended up to 100 meters).

VI. Standard Accessories (Standard Factory Configuration)

1 Industrial-grade welding clamp + 5 meters of national standard welding wire;

1 set of grounding clamps + 3 meters of national standard grounding wire;

Product manual and certificate of conformity.

VII. Usage Tips

Small welding rods ( 2.5/3.2): Main current knob 1~4, thrust 2~3;

Large welding rods ( 4.0/5.0): Main current 5~9, thrust 5~7;

Vertical/Overhead welding: Appropriately increase arc thrust to reduce molten pool sag and achieve a smoother weld bead.

What's in the box
1 x Arc Welding Machine