Wiktor Wise
Electric arc welding is a fusion welding process that uses electricity to generate enough heat to melt and join metals together. The electric arc is formed between a non-consumable or consumable electrode and the metal workpiece, creating a solid weld. This process can be manual, semi-automatic, or fully automated, and it is widely used in various industries, including automotive, shipbuilding, construction, and aerospace. Different types of arc welding include shielded metal arc welding (SMAW), gas tungsten arc welding (GTAW), and gas metal arc welding (GMAW). Each type of arc welding has its advantages and disadvantages, and the choice of welding process depends on factors such as the type of metal, welding position, and desired results.
| Characteristics | Values |
|---|---|
| Type of welding with electrical arc | Arc welding |
| How it works | An electric arc is created between a metal stick ("electrode") and the base material to melt the metals at the point of contact. |
| Temperature | 3500 °C to 4000 °C |
| Applications | Shipbuilding, construction, industrial manufacturing, automotive, aerospace |
| Advantages | Strong, durable welds, versatile, inexpensive, high speed |
| Disadvantages | Requires skilled operators, cannot be used for reactive metals or thin metals |
| Types | Shielded metal arc welding (SMAW), gas tungsten arc welding, capacitor discharge arc welding, plasma arc welding, gas-shielded, self-shielded |
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What You'll Learn
Shielded metal arc welding (SMAW)
The electrode rod is made of a material that is compatible with the base material being welded and is covered with a flux that gives off vapours that serve as a shielding gas and provide a layer of slag, protecting the weld area from atmospheric contamination. The electrode core itself acts as filler material, making a separate filler unnecessary. The process is versatile and requires little operator training and inexpensive equipment. However, weld times are rather slow, as the consumable electrodes must be frequently replaced, and the slag residue from the flux must be chipped away after welding.
SMAW is widely used across various industries due to its ability to weld a broad range of metals and operate in different welding positions and environments, including challenging conditions. It is particularly dominant in the maintenance and repair industry and is heavily used in the construction of steel structures and in industrial fabrication. SMAW is often used to weld carbon steel, low and high alloy steel, stainless steel, cast iron, and ductile iron. It can also be used on nickel and copper and their alloys and, in rare cases, on aluminium.
Although SMAW is almost exclusively a manual process, one notable process variation exists, known as gravity welding or gravity arc welding. It serves as an automated version of the traditional SMAW process, employing an electrode holder attached to an inclined bar along the length of the weld. Once started, the process continues until the electrode is spent, allowing the operator to manage multiple gravity welding systems.
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Gas tungsten arc welding
GTAW is a versatile process that can be used on both ferrous and non-ferrous metals and in all welding positions. It can be performed manually or automatically, depending on the application. The process is well-suited for welding thin or thick materials, with or without a filler metal. When welding thinner materials, edge joints, and flanges, filler metals are typically not used, while for thicker materials, an externally fed filler wire is generally required. The type of filler metal wire is chosen based on the chemical analysis of the base metal, and its size depends on the thickness of the base metal, which usually dictates the welding current.
GTAW offers greater control over the weld area compared to other welding processes, allowing skilled operators to produce high-quality, stronger, and deeper welds that are resistant to corrosion and cracking over long periods. This makes GTAW the preferred welding procedure for critical operations such as sealing spent nuclear fuel canisters before burial.
The development of GTAW can be traced back to the early 1940s, when Russell Meredith created the process using a tungsten electrode arc and helium as the shielding gas. Over time, advancements were made to address issues with electrode overheating and welding certain non-ferrous materials. The polarity of the electrode was changed, and the development of alternating current units further stabilized the arc and improved the quality of welds for aluminum and magnesium.
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Self-shielded arc welding
Arc welding is a welding process that uses electricity to generate enough heat to melt metal. The melted metals then cool down, resulting in a strong bond between the metals. This type of welding uses a welding power supply to create an electric arc between a metal stick (also known as an electrode) and the base material.
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Gas-shielded arc welding
The GMAW process can be semi-automatic or fully automatic, and it is known for its versatility, speed, and ease of adaptation to robotic automation. It is widely used in various industries, including automotive, shipbuilding, construction, and aerospace. GMAW has four primary methods of metal transfer: globular, short-circuiting, spray, and pulsed-spray, each with distinct advantages and limitations.
The choice of shielding gas depends on the material being welded and the process variation. Inert gases such as argon and helium are used for non-ferrous welding, while active gases like carbon dioxide are used for deeper penetration welds on steels. The shielding gas flow rate also varies depending on the welding process, with smaller weld pools requiring lower gas flow rates and larger weld pools needing higher rates to ensure adequate protection.
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Capacitor discharge arc welding
Arc welding is a welding process that uses electricity to generate enough heat to melt metal. The melted metals then cool and result in a joining of the metals. There are various types of arc welding, one of which is capacitor discharge stud welding.
Capacitor discharge stud welding is a fast and efficient process used to attach studs to metal surfaces. The tip of the stud melts almost instantly when the energy stored in capacitors is discharged through it. The instantaneous energy is discharged from banks of low-voltage DC electrostatic capacitors, electronically controlled and triggered on demand by the operator. The triggering circuit releases the stored energy from the capacitors through the stud, vaporizing the high-resistance tip and creating an ionization path for peak current flow and arcing across the areas to be joined. The spring or air pressure of the gun upon the partially melted stud fuses it to the parent metal surface, completing the weld in four to six milliseconds. The bond formed is stronger than the fastener itself.
The three basic modes of capacitor discharge (CD) stud welding are initial-gap welding, initial-contact welding, and drawn-arc welding. The process is advantageous when working with thin or delicate materials as it results in minimal damage to the base material. This is due to the rapid heating and cooling of the stud, which creates a small heat-affected zone, minimizing the potential for material weakening or distortion in the surrounding area.
Capacitor discharge stud welding is also easy to use, with equipment that is generally more straightforward to operate than that of other welding techniques. This ease of use leads to quicker setup times and reduced training requirements for operators. Additionally, the process is known for producing clean and precise welds, making it a popular choice in manufacturing.
Compared to drawn arc stud welding, capacitor discharge stud welding is better suited for smaller stud diameters, thinner materials, and certain types of base metals. The choice between the two methods depends on factors such as the specific application, material thickness, desired welding speed, and the quality requirements of the finished weld.
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Frequently asked questions
Electric arc welding is a welding process that uses electricity to create enough heat to melt metal. An electric arc is created between a metal stick (electrode) and the base material, melting the metals at the point of contact. The melted metals then cool, resulting in a strong weld joining the metals.
There are several types of electric arc welding, including:
- Shielded metal arc welding (SMAW) or manual metal arc welding (MMAW)
- Gas tungsten arc welding (GTAW)
- Gas metal arc welding (GMAW)
- Plasma arc welding (PAW)
- Capacitor discharge arc welding
Electric arc welding has several advantages, including its versatility, portability, and ability to produce strong and reliable welds. It is widely used in various industries, such as construction, shipbuilding, automotive, and manufacturing. However, one disadvantage is that it requires skilled operators and cannot be used for welding reactive or thin metals. Additionally, it can produce dangerous fumes and particles, requiring proper safety equipment and ventilation.
