1. Introducción y másview
The Esab Rustler EM 300i is a state-of-the-art inverter welding machine designed for professional and demanding welding applications. Engineered with a unique, modern design and meticulous attention to detail, the Rustler series incorporates the latest inverter technology to deliver low energy consumption and superior welding quality.
This machine is optimized for welding a wide variety of metals, offering specific programs for electrodes, solid and tubular wires, carbon steel, stainless steel, aluminum, and even MIG brazing. It is suitable for both experienced welders and beginners due to its ease of handling and setup.

Figura 1.1: Lado frontal view of the Esab Rustler EM 300i Inverter Welding Machine, showcasing its robust design and integrated wheels for mobility.
Características principales:
- Entrada de potencia versátil: Compatible with single-phase 220V or three-phase 220/380V power networks.
- Operación fácil de usar: Easy to handle, configure, and weld, catering to both experienced and novice welders.
- Diseño inteligente: Features an angled control panel, large ergonomic handles, and a protected panel for durability and ease of use.
- Guaranteed Robustness: Tested and approved through rigorous global testing standards, ensuring reliability and longevity.
- Energy-Saving Inverter Technology: Promotes significant energy savings during operation.
- On-Demand Ventilation: Provides cooling only when necessary, reducing energy consumption and minimizing dust ingress into the equipment.
- Advanced Welding Configurations: Includes 2T or 4T welding, inductance control, creep start, burn-back, crater fill, and pre/post-gas flow control for optimized arc adjustment in MIG/MAG applications.
- Coated Electrode Functions: Equipped with Hot Start, Arc Force, and Anti-stick features for superior coated electrode welding.
Aplicaciones:
- General Fabrication
- Steel Constructions
- Reparación y mantenimiento
- Blacksmithing
- Agricultural Implements

Figura 1.2: Sobreview of the Esab Rustler EM 300i's applications and highlighted features, emphasizing its versatility and advanced capabilities.
2. Información de seguridad
Welding operations involve inherent risks. It is crucial to follow all safety guidelines to prevent injury or damage to equipment. Always wear appropriate Personal Protective Equipment (PPE), including welding helmet, gloves, protective clothing, and safety shoes.
- Descarga eléctrica: Puede ser mortal. No toque componentes eléctricos con corriente. Aíslese del trabajo y de la tierra.
- Humos y Gases: Puede ser peligroso para la salud. Mantenga la cabeza alejada de los vapores. Utilice ventilación o extractores para eliminar los vapores de la zona de respiración.
- Rayos de arco: Puede quemar los ojos y la piel. Use un casco de soldar con un filtro adecuado y ropa protectora.
- Incendio y Explosión: Welding can cause fire or explosion. Keep combustibles away from the work area. Have a fire extinguisher readily available.
- Partes calientes: Puede causar quemaduras graves. Deje que el equipo se enfríe antes de tocarlo.
- Ruido: El ruido excesivo puede dañar la audición. Use protección auditiva.
- Partes móviles: Can cause injury. Keep clear of moving parts such as wire feed rolls.
Always read and understand the entire safety section of this manual before operating the welding machine. Ensure the work area is well-ventilated and free from flammable materials.
3. Configuración
Proper setup is essential for safe and efficient operation of your Esab Rustler EM 300i welding machine. Follow these steps carefully:
3.1 Desembalaje e inspección
- Retire con cuidado la máquina de soldar y todos los accesorios del embalaje.
- Inspect the machine for any signs of shipping damage. Report any damage to your supplier immediately.
- Verifique que todos los componentes enumerados en la lista de embalaje estén presentes.
3.2 Conexión de alimentación
The Rustler EM 300i supports both single-phase 220V and three-phase 220/380V power inputs. Ensure the power supply matches the machine's requirements and that the circuit is adequately protected.
- Connect the power cable to a suitable power outlet. Consult a qualified electrician if you are unsure about the correct connection for three-phase power.
- Ensure the main power switch on the machine is in the "OFF" position before connecting to power.

Figure 3.1: Power input options for the Esab Rustler EM 300i, indicating compatibility with both single-phase and three-phase systems.
3.3 Wire Feeder Setup (MIG/MAG)
The machine features an integrated 2-roller wire feeder.
- Open the side panel of the machine to access the wire spool compartment.
- Mount the appropriate welding wire spool onto the spindle. Ensure the wire unwinds smoothly.
- Thread the wire through the guide tube and into the wire feeder rollers.
- Adjust the tension of the wire feeder rollers according to the wire diameter and type.
- Cierre el panel lateral de forma segura.

Figure 3.2: The Esab Rustler EM 300i with its side panel open, revealing the internal wire feeder system for easy wire spool installation.
3.4 Gas Connection (MIG/MAG)
For MIG/MAG welding, a shielding gas cylinder is required.
- Connect the gas hose from the machine to the pressure regulator on the gas cylinder.
- Asegúrese de que todas las conexiones estén bien ajustadas para evitar fugas de gas.
- Abra la válvula del cilindro de gas lentamente.
3.5 Cl de tierraamp and Torch Connection
- Conecte el cable de tierraamp cable to the appropriate terminal on the machine.
- Fije firmemente el soporte de tierra.amp a la pieza de trabajo, asegurando un buen contacto eléctrico.
- Connect the welding torch (MIG/MAG or MMA electrode holder) to its respective connection point on the front panel.

Figura 3.3: detallada view of the Esab Rustler EM 300i's front panel, showing control knobs and connection ports for welding cables and torch.
4. Instrucciones de funcionamiento
This section provides general operating instructions for the Esab Rustler EM 300i. Refer to the specific welding process for detailed parameter settings.
4.1 Encendido / Apagado
- To power on the machine, turn the main power switch to the "ON" position. The display will illuminate.
- To power off, turn the main power switch to the "OFF" position.
Selección de 4.2 modos
The Rustler EM 300i supports multiple welding processes. Use the control panel to select the desired mode:
- Soldadura MIG/MAG: For gas-shielded metal arc welding.
- Soldadura MMA (con electrodo): For shielded metal arc welding with coated electrodes.
4.3 Ajuste de parámetros
Adjust welding parameters using the control knobs on the front panel. The digital display will show the selected values.
- Actual (Amppromedio): Controls the heat input.
- Volumentage: Affects arc length and bead profile (primarily for MIG/MAG).
- Velocidad de cable: Controls the rate at which welding wire is fed (for MIG/MAG).
- Inductancia: Adjusts arc stiffness and bead wetness (for MIG/MAG).
4.4 Advanced MIG/MAG Features
The Rustler EM 300i offers several advanced features for optimized MIG/MAG welding:
- 2T/4T Welding:
- 2T (Dos toques): Mantenga presionado el gatillo para soldar; suéltelo para detener.
- 4T (Cuatro toques): Press and release to start; press and release again to stop. Ideal for long welds.
- Creep Start: Provides a slow wire feed start to prevent wire stubbing.
- Quemadura en retroceso: Controls the length of wire extending from the torch nozzle after welding stops.
- Crater Fill: Gradually reduces current at the end of a weld to fill the crater and prevent cracking.
- Pre/Post Gas Flow: Controls the gas flow before and after welding to protect the weld puddle.

Figure 4.1: A welder utilizing the Esab Rustler EM 300i, demonstrating the application of its adjustable MIG/MAG features in a workshop environment.
4.5 Características de la soldadura MMA (con electrodo revestido)
- Arranque en caliente: Provides a temporary increase in current at the start of welding to ensure easy arc ignition.
- Fuerza del arco: Automatically adjusts the current to prevent the electrode from sticking during welding.
- Antiadherente: Reduces the current to a minimum if the electrode sticks, allowing it to be easily removed without damaging the machine.
5. Mantenimiento
Regular maintenance ensures the longevity and optimal performance of your Esab Rustler EM 300i. Always disconnect the machine from the power supply before performing any maintenance.
5.1 Mantenimiento diario
- Clean the exterior of the machine with a dry, soft cloth to remove dust and debris.
- Check all cables and connections for damage or loose fittings. Replace or tighten as necessary.
- Inspect the welding torch and ground clamp por desgaste.
5.2 Mantenimiento semanal/mensual
- Clean the wire feeder rollers and guide tubes to ensure smooth wire feeding. Remove any metal dust or debris.
- Use compressed air to blow out dust from the cooling vents. Ensure the air is dry and oil-free.
- Check the gas hose for leaks using a leak detection spray (for MIG/MAG).
5.3 Periodic Maintenance (by Qualified Personnel)
- Internal cleaning and inspection of electrical components.
- Calibration checks.
- Sustitución de piezas desgastadas.
For any complex maintenance or repairs, contact an authorized Esab service center.
6. Solución de problemas
This section provides solutions to common issues you might encounter with your Esab Rustler EM 300i. For problems not listed here, contact Esab technical support.
| Problema | Posible causa | Solución |
|---|---|---|
| La máquina no se enciende. | No hay suministro de energía; interruptor principal apagado; disyuntor disparado. | Check power cable connection; turn main switch on; reset circuit breaker. |
| Sin arco de soldadura. | Poor ground connection; incorrect settings; faulty torch/electrode holder; thermal overload. | Asegúrese de que el suelo esté limpioamp is secure and on clean metal; verify welding parameters; check torch/holder for damage; allow machine to cool if overload indicator is on. |
| Wire feeding issues (MIG/MAG). | Incorrect wire tension; clogged liner; wrong drive rollers; wire spool tangled. | Adjust wire tension; clean/replace liner; ensure correct drive rollers for wire size; untangle wire spool. |
| Mala calidad de soldadura. | Incorrect parameters; insufficient gas shielding; contaminated workpiece; wrong wire/electrode. | Ajustar corriente/volumentage/wire speed; check gas flow and connections; clean workpiece; use correct consumables. |
| Gas flow issues (MIG/MAG). | Gas cylinder empty; regulator closed; hose kinked/leaking; clogged nozzle. | Check gas cylinder level; open regulator; inspect hose; clean/replace nozzle. |
7. Especificaciones
Detailed technical specifications for the Esab Rustler EM 300i Inverter Welding Machine.
| Atributo | Valor |
|---|---|
| Modelo | EM300i |
| Marca | Esab |
| Fabricante | Esab |
| ASIN | B0C667K971 |
| EAN | 7895678041430 |
| Vol de entradatage | Single-phase 220V / Three-phase 220V/380V |
| Output Current (Duty Cycle) | 250A al 40% |
| Wire Feeder Type | 2-roller integrated |
| Dimensiones del paquete (L x W x H) | 98 x 75 x 37 cm (38.6 x 29.5 x 14.6 pulgadas) |
| Peso | 47 kg (103.6 libras) |
| Disponible para compra desde | 29 de mayo de 2023 |
8. Garantía y soporte
8.1 Garantía del producto
The Esab Rustler EM 300i comes with a 3 año de garantía, supported by Esab's extensive technical assistance network.
8.2 ESAB Technical Delivery Service
Esab offers an exclusive, complimentary "Technical Delivery" service to customers after the purchase of new equipment. This service aims to provide technical installation of the product, followed by basic training and presentation of the main features and functionalities of the equipment, as well as its correct application.
The ESAB Technical Delivery service is limited to a 200km (round trip) distance between the nearest authorized assistance center and the customer's address.

Figure 8.1: Information regarding the ESAB Technical Delivery service, detailing its scope and limitations.
For further information or to request support, please visit the official Esab websitio o póngase en contacto con su distribuidor local autorizado.
Official Esab Websitio: esab.com.br





