High Quality MMA Welding Machines for Hobbyists and Pros
Experience seamless welds every time: Durable, Efficient, and User-Friendly Solutions
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JUNIOR RANGE
- Output Current Range: 20-120A
- Electrode Range: 1.6-3.2mm
- Input Power: 220V 50/60Hz
- Rated Input Capacity: 4.8KVA
- Rated Input Current: 21.8A
- Open Circuit Voltage: 60V
SENIOR RANGE
- Output Current Range: 20-140A
- Electrode Range: 1.6-4.0mm
- Input Power: 220V 50/60Hz
- Rated Input Capacity: 5.8KVA
- Rated Input Current: 26.4A
- Open Circuit Voltage: 65V
INDUSTRIAL RANGE
- Output Current Range: 20-315A
- Electrode Range: 1.6-6.0mm
- Input Power: 3P~380V 50/60Hz
- Rated Input Capacity: 16.5KVA
- Rated Input Current: 25A
- Open Circuit Voltage: 70V
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Top-notch materials and decades of precise craftsmanship for lasting quality.
Cutting-edge Technology
Designed using the latest technology for superior performance
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Get your machines when needed with our streamlined processes.
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From design to branding, our OEM service offers tailored solutions for your exact requirements.
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Table of Contents
Your Ultimate Guide to Understand MMA Welding
MMA History
Manual Metal Arc (MMA) welding, also known as Stick or Shielded Metal Arc Welding (SMAW), is a versatile welding process with roots tracing back to Russia in 1888. Initially utilizing bare metal welding rods, the technique evolved with the introduction of coated electrodes by the Kjellberg process in Sweden and the Quasi arc method in the UK during the early 20th century. Despite its slow initial uptake due to high production costs, the demand for more robust welds led to its widespread adoption.
MMA Process
MMA welding involves creating an arc between the electrode and the workpiece, melting both to form a weld pool. The electrode’s flux coating melts simultaneously, providing a protective shield over the molten pool to prevent contamination and aid arc stability. This results in the formation of a protective slag over the weld, which must be removed after cooling. Given the electrode’s limited length, this process is suited for shorter welds, demanding a new electrode for extended welding. Weld quality depends on the welder’s skill.
MMA welding power sources provide constant current (CC) output, in either AC or DC. The welding inverter adjusts current based on arc length: extending it reduces current, while shortening it increases current. Voltage controls weld bead size, and current controls penetration, requiring skilled electrode manipulation by the welder.
Arc voltage and current determine the power used in welding. Electrode diameter and distance from the workpiece affect voltage, while electrode diameter, material thickness, and weld position influence current. Most electrodes specify compatible current types and optimal ranges.
Modern welding inverters offer better performance and control, with electronically adjustable output curves for each process. Inverter designs are lightweight, portable, energy-efficient, and offer high performance and control.
For optimal results, welding in flat or horizontal positions is preferred. When welding vertically or overhead, reducing welding current compared to horizontal welding is beneficial. Consistent electrode feeding, uniform movement, and travel speed are crucial in all positions.
MMA Advantages and Drawbacks
MMA (Manual Metal Arc) welding is highly versatile and requires minimal skill to learn. Its simple equipment makes it widely used globally.
Key Advantages:
- Versatile: Can weld various materials
- Flexible: Works in horizontal, vertical, or overhead positions
- Remote Use: Can weld at a distance from power source
- Self-Shielding: Suitable for outdoor welding
- Commonly Used: Dominant in maintenance, repair, structural, and fabrication industries
Drawbacks:
- Short welds
- Slag removal
- Stop-starts reduce efficiency (typically 25%)
- Weld quality depends on operator skill, leading to potential issues.
MMA Welding System Overview
Key components of an MMA welding setup include the welding inverter power source, capable of delivering high current at low voltage, and the electrode holder with its associated welding cables. The electrode holder should ensure a firm grip on the electrode to maintain arc stability. The choice of welding cable diameter is crucial and depends on the welding current level and the distance from the power source to prevent voltage drop and overheating.
The Power Source
When choosing a welding power source, ensure it can generate enough power to melt the electrode and weld material while maintaining the arc voltage. For MMA welding, you typically need high current (50-350A) at low voltage (10-50V). Use electrodes designed for the specific power and voltage requirements, as not all can be used on both AC and DC.
Ensure the electrode lead is connected to the recommended polarity (usually positive for DC). The power source should have a “no load” voltage rating as per standard EN 60974-1:2012, and may include a voltage reduction device (VRD) to reduce no-load voltage to a lower level (usually 12-30V) until an arc is struck.
Common power source types include AC output transformer, AC/DC transformer rectifier, AC/DC inverter, and engine-driven DC or AC output sources.
The Electrode Holder and Cables
The electrode holder clamps the electrode with conductive clamps, usually by a twist or spring-loaded clamp action. A firm clamp is essential for good electrical contact to prevent arc instability and overheating. The holder should conform to IEC 60974-11. Connections between electrode, holder, and cable must be good to avoid overheating and arcing.
There are two cables from the power source: the welding lead to the electrode holder and the work return lead clamped to the workpiece. The latter is often called the earth lead, although a separate earth lead may be needed for protection from faults in the power source.
Welding cables are covered in a protective sheath, usually rubberized or PVC, providing electrical insulation at voltages not exceeding 100V DC and AC. Cable diameter is selected based on welding current, with larger diameters used for higher currents and longer distances from the power source to reduce voltage drop.
Nominal Cross Sectional Area of the Conductors (mm²) | Max Dia of Conductor Wire (Strand, mm) | Thickness of Covering (mm) | Mean Overall Dia (mm) | Max Conductor Resistance at 20°C (Ohms/km) | Capacity of Conductor at 60% Duty Cycle (A) |
16 | 0.31 | 1.8 | 8.2 | 1.21 | 175 |
25 | 0.31 | 2.0 | 10.2 | 0.78 | 230 |
35 | 0.31 | 2.2 | 12.0 | 0.554 | 290 |
50 | 0.31 | 2.4 | 13.5 | 0.386 | 365 |
70 | 0.31 | 2.6 | 15.6 | 0.272 | 460 |
90 | 0.31 | 2.8 | 18.2 | 0.206 | 560 |
120 | 0.31 | 3.0 | 20.4 | 0.161 | 650 |
The Welding Electrode
Electrodes are crucial in welding, comprising a core material providing weld filler metal and a flux coating. The coating influences arc stability, penetration depth, deposition rate, and positional features. Electrodes are classified into basic, cellulosic, and rutile types.
Basic electrodes contain calcium carbonate and calcium fluoride, offering good weld quality and mechanical properties. They require high welding currents and speeds, and slag removal can be difficult. Cellulosic electrodes contain cellulose, providing deep penetration and high welding speeds but can generate a high level of hydrogen, increasing the risk of cracking. Rutile electrodes contain titanium oxide, offering easy arc ignition, smooth operation, and low spatter.
Metal powder electrodes contain metal powder in the flux coating to increase the maximum welding current level and deposition rate. They are used mainly in flat and horizontal/vertical positions for higher deposition rates.
Other types include hard/wear facing electrodes, used to put a hard surface over a softer base material, and DC copper-coated electrodes, which provide stable arc characteristics and uniform grooves.
AC coated electrodes are constructed similarly to DC copper-coated electrodes but have added rare earth materials for arc stabilization. DC plain electrodes are constructed like DC copper-coated electrodes but without the copper coating, resulting in faster consumption during use.
Welding Electrode Storage
Store electrodes in a dry, well-ventilated area, stacked on wooden pallets or racks, clear of the floor. Unused electrodes to be returned should be kept dry. Ideal storage conditions are 10°C above external air temperature. Electrodes stored in original packaging under these conditions have practically unlimited storage time. Modern hermetically sealed packs eliminate the need for drying, but if necessary, unused electrodes must be redried per the manufacturer’s instructions.
Drying of Electrodes
Drying should follow the manufacturer’s recommendations, which vary by electrode type. Hermetically sealed containers remove the need for immediate drying. If a container is opened or damaged, electrodes must be redried according to the manufacturer’s instructions.
Electrode Selection
Choose electrode diameter based on workpiece thickness, welding position, joint form, and welding layer. The welding current level is determined by the electrode size, with the recommended operating range provided by the manufacturers. See the table for typical operating ranges for various electrode sizes.
DC Electrode Dia (mm) | Min Current (A) | Max Current (A) | Average Current (A) |
1.6 | 25 | 45 | 40 |
2.0 | 34 | 65 | 50 |
2.5 | 50 | 90 | 90 |
3.2 | 60 | 130 | 115 |
4.0 | 100 | 180 | 140 |
5.0 | 150 | 250 | 200 |
6.0 | 200 | 310 | 280 |
Controls Used In MMA
Current Control (A)
The current control regulates the current output from the machine, affecting the deposition rate based on the electrode diameter. Modern electronic power sources often allow current control via remote controls.
Hot Start
At the beginning of welding, the hot start provides an increased current to help the electrode strike the arc without sticking to the workpiece. Some machines have automatic hot start current with a set time and level, while others offer variable hot start control for operators to select.
Arc Force
During welding, the arc voltage is typically around 20V. Sometimes, a shorter arc is needed, resulting in a lower voltage and a risk of the electrode sticking to the workpiece as the arc extinguishes. Arc force control increases the current when the arc voltage drops, ensuring metal transfer and preventing electrode sticking. Machines may have automatic arc force current or variable arc force control for operators to choose the required level.
Technical Data
Model | JUNIOR MMA-120 M1 | JUNIOR MMA-140 M1 | JUNIOR MMA-120 M6 | JUNIOR MMA-140 M6 | JUNIOR MMA-160 M6 | JUNIOR MMA-180 M6 | JUNIOR MMA-200 M6 |
Input Power | 220V 50/60Hz | 220V 50/60Hz | 220V 50/60Hz | 220V 50/60Hz | 220V 50/60Hz | 220V 50/60Hz | 220V 50/60Hz |
Rated Input Capacity (KVA) | 4.8 | 5.8 | 4.8 | 5.8 | 6.8 | 7.9 | 9.2 |
Rated Input Current (A) | 21.8 | 26.4 | 21.8 | 26.4 | 30.9 | 35.9 | 41.8 |
Open Circuit Voltage (V) | 60 | 60 | 62 | 62 | 62 | 62 | 62 |
Open Circuit Range (A) | 20-120 | 20-140 | 20-120 | 20-140 | 20-160 | 20-180 | 20-200 |
Rated Duty Cycle @25°C | 40% | 40% | 50% | 50% | 50% | 40% | 40% |
Suitable Electrode (mm) | 1.6-3.2 | 1.6-4.0 | 1.6-3.2 | 1.6-4.0 | 1.6-4.0 | 1.6-4.0 | 1.6-5.0 |
Protection Class | F | F | F | F | F | F | F |
Insulation Class | IP21S | IP21S | IP21S | IP21S | IP21S | IP21S | IP21S |
NW (kg) | 3 | 3.4 | 4 | 4.4 | 4.6 | 4.9 | 5.3 |
Model | JUNIOR MMA-140 M8 | JUNIOR MMA-160 M8 | JUNIOR MMA-180 M8 | JUNIOR MMA-200 M8 | JUNIOR MMA-220 M8 | SENIOR MMA-140 P1/P2/P3/P4 | SENIOR MMA-160 P1/P2/P3/P4 | SENIOR MMA-180 P1/P2/P3/P4 | SENIOR MMA-200 P1/P2/P3/P4 | SENIOR MMA-220 P1/P2/P3/P4 |
Input Power | 220V 50/60Hz | 220V 50/60Hz | 220V 50/60Hz | 220V 50/60Hz | 220V 50/60Hz | 220V 50/60Hz | 220V 50/60Hz | 220V 50/60Hz | 220V 50/60Hz | 220V 50/60Hz |
Rated Input Capacity (KVA) | 5.8 | 6.8 | 7.9 | 9.2 | 10.2 | 5.8 | 6.8 | 7.9 | 9.2 | 10.2 |
Rated Input Current (A) | 26.4 | 30.9 | 35.9 | 41.8 | 46.3 | 26.4 | 30.9 | 35.9 | 4.1.8 | 46.3 |
Open Circuit Voltage (V) | 65 | 65 | 65 | 65 | 65 | 65 | 65 | 65 | 65 | 65 |
Open Circuit Range (A) | 20-140 | 20-160 | 20-180 | 20-200 | 20-220 | 20-140 | 20-160 | 20-180 | 20-200 | 20-220 |
Rated Duty Cycle @25°C | 50% | 50% | 40% | 40% | 30% | 50% | 50% | 40% | 40% | 30% |
Suitable Electrode (mm) | 1.6-4.0 | 1.6-4.0 | 1.6-4.0 | 1.6-5.0 | 1.6-5.0 | 1.6-4.0 | 1.6-4.0 | 1.6-4.0 | 1.6-5.0 | 1.6-5.0 |
Protection Class | F | F | F | F | F | F | F | F | F | F |
Insulation Class | IP21S | IP21S | IP21S | IP21S | IP21S | IP21S | IP21S | IP21S | IP21S | IP21S |
NW (kg) | 4.8 | 5 | 5.3 | 5.4 | 6 | 4.8 | 5 | 5.3 | 5.4 | 6 |
Model | HANDHELD MMA-120 P8 | HANDHELD MMA-120 P8 | LCD MMA-140 P1 | LCD MMA-160 P1 | LCD MMA-180 P1 | LCD MMA-200 P1 | LCD MMA-220 P1 |
Input Power | 127V 50/60Hz | 220V 50/60Hz | 220V 50/60Hz | 220V 50/60Hz | 220V 50/60Hz | 220V 50/60Hz | 220V 50/60Hz |
Rated Input Capacity (KVA) | 4.8 | 4.8 | 5.8 | 6.8 | 7.9 | 9.2 | 10.2 |
Rated Input Current (A) | 37.8 | 21.8 | 26.4 | 30.9 | 35.9 | 41.8 | 41.8 |
Open Circuit Voltage (V) | 65 | 65 | 65 | 65 | 65 | 65 | 65 |
Open Circuit Range (A) | 20-120 | 20-140 | 20-140 | 20-160 | 20-180 | 20-200 | 20-220 |
Rated Duty Cycle @25°C | 50% | 50% | 50% | 50% | 40% | 40% | 30% |
Suitable Electrode (mm) | 1.6-3.2 | 1.6-3.2 | 1.6-4.0 | 1.6-4.0 | 1.6-4.0 | 1.6-5.0 | 1.6-5.0 |
Protection Class | F | F | F | F | F | F | F |
Insulation Class | IP21S | IP21S | IP21S | IP21S | IP21S | IP21S | IP21S |
NW (kg) | 10.7 | 10.7 | 3.4 | 3.6 | 5.2 | 5.4 | 5.8 |
Model | DIGITAL MMA-140 P2 | DIGITAL MMA-160 P2 | DIGITAL MMA-180 P2 | DIGITAL MMA-200 P2 | DIGITAL MMA-220 P2 | MMA-315 M12 | MMA-400 M12 | MMA-500 M12 |
Input Power | 220V 50/60Hz | 220V 50/60Hz | 220V 50/60Hz | 220V 50/60Hz | 220V 50/60Hz | 220V 50/60Hz | 220V 50/60Hz | 220V 50/60Hz |
Rated Input Capacity (KVA) | 5.8 | 6.8 | 7.9 | 9.2 | 10.2 | 16.5 | 23.2 | 32.2 |
Rated Input Current (A) | 26.4 | 30.9 | 35.9 | 41.8 | 46.3 | 25 | 35.2 | 48.9 |
Open Circuit Voltage (V) | 65 | 65 | 65 | 65 | 65 | 70 | 72 | 73 |
Open Circuit Range (A) | 20-140 | 20-160 | 20-180 | 20-200 | 20-220 | 20-315 | 20-400 | 20-500 |
Rated Duty Cycle @25°C | 50% | 50% | 40% | 40% | 30% | 60% | 60% | 60% |
Suitable Electrode (mm) | 1.6-4.0 | 1.6-4.0 | 1.6-4.0 | 1.6-5.0 | 1.6-5.0 | 1.6-6.0 | 1.6-8.0 | 1.6-8.0 |
Protection Class | F | F | F | F | F | F | F | F |
Insulation Class | IP21S | IP21S | IP21S | IP21S | IP21S | IP21S | IP21S | IP21S |
NW (kg) | 3.4 | 3.6 | 5.2 | 5.4 | 5.8 | 19.8 | 24.3 | 34.6 |
Insights and Clarifications on Our Products and Services
FAQs
We provide a 12-month limited warranty for our distributors. This warranty becomes effective from the loading date as indicated on the Bills of Lading for sea shipments.
For other delivery methods, the warranty period starts from the shipment date from our factory.
Our standard lead time is 4 weeks. However, during the peak season from November to March, lead times may be longer.
Our minimum order (MOQ) requirement is set at USD 4,000 to adequately cover fixed logistics and handling expenses.
Nevertheless, we welcome orders of smaller quantities, even as little as one piece, from new customers for testing purposes, provided that the freight expenses are borne by the client.
Absolutely, we offer OEM services to meet your branding requirements, including custom nameplates and tailored packaging solutions.
We prefer wire transfers (T/T) – 30% upfront and the balance before we ship your order. If we’re racing against time and the lead time is under 3 weeks, we’d appreciate full payment upfront. It just helps speed things up!
