Soldadura electrodo ARCO electrico parte 1 tutorial

Overview of Arc Welding with Coated Electrodes

Introduction to Arc Welding

• The arc welding method using coated electrodes is widely used due to its simplicity and safety, despite competition from more productive welding techniques that offer equal or superior aesthetic and metallurgical quality.

Components of the Electrode

• Coated electrodes consist of a metallic core, which defines the electrode's nominal diameter, and an external coating made from powdered substances bound together and dried in an oven.

• The core conducts electric current to sustain the arc while also providing material for the weld bead; the coating protects the molten pool from atmospheric contamination.

Functionality of Welding Equipment

• Welding equipment is essential for installation; some devices use alternating current (AC), while others utilize direct current (DC). AC machines are primarily used in construction, whereas DC machines are preferred in industries with specific requirements.

Electrical Connections and Polarities

• In DC welding equipment, operators must connect cables from the electrode holder and ground terminal to the power source's two poles. The polarity is direct if connected to negative and inverse if connected to positive.

Voltage and Current Characteristics

• Output terminals on welding equipment can measure open-circuit voltage, typically ranging between 50V and 80V. When contact occurs with workpieces, short-circuit current and voltage change significantly.

Control Systems in Modern Welding Equipment

Electronic Regulation of Parameters

• Modern welding machines feature electronic circuits that adjust operational parameters based on variations in arc length, ensuring consistent performance during operation.

Static Characteristics of Equipment

• Different types of welding equipment can be categorized by their static characteristics: descending or constant. These characteristics define how voltage relates to current during operation.

Conventional Voltage Relationships

• In coated electrode welding, conventional voltage correlates with current intensity through an experimental relationship: V = 20 + 0.04 * I (where I is current intensity).

Technical Specifications for Power Sources

Evaluating Power Source Features

• Power sources for welding come with technical specifications displayed on a fixed plate attached to the unit. This plate includes essential data defining performance capabilities along with safety standards adhered to by manufacturers.

Example Specifications

• An example specification plate may detail electrical supply requirements, international compliance standards followed by manufacturers, type of welding procedure employed, static characteristics of power sources, as well as minimum and maximum operational currents.