Materi Pengelasan OAW Untuk Jurusan Teknik Mesin ‼️

Summary

In this video, Andri Pratama explains the basics of OAW (Oxygen-Acetylene Welding), a technique used to join metals using a high-temperature flame produced by a mixture of oxygen and acetylene gas. He discusses the types of flames (carburizing, oxidation, and neutral), their applications, and the equipment needed, including gas cylinders, regulators, and torches. The video also highlights essential safety gear like helmets, gloves, and masks, emphasizing the importance of both proper tools and personal protection during welding work. This guide is useful for students and professionals in welding.

Takeaways

• 😀 OAW welding involves connecting metals using a high-temperature flame produced by the combustion of oxygen and acetylene.
• 😀 Acetylene is chosen as a fuel gas in OAW welding because it produces a higher flame temperature compared to other gases.
• 😀 The OAW welding process begins with the combustion of acetylene and oxygen to create a flame that melts the filler metal and base metal.
• 😀 There are two types of fuels used in OAW welding: Acetylene (C2H2) and Propane (C3H8).
• 😀 Three types of flames are used in OAW welding: carburizing, oxidation, and neutral flames, each suited for different materials and applications.
• 😀 The carburizing flame, with more acetylene, has a maximum temperature of 3,000°C, unsuitable for metals with a higher melting point.
• 😀 The oxidation flame, with more oxygen, reaches temperatures of 3,300°C and is ideal for welding copper alloys and other metals excluding iron-based alloys.
• 😀 The neutral flame, balanced between oxygen and acetylene, has a maximum temperature of 3,200°C and is commonly used for welding steel, cast iron, and aluminum.
• 😀 OAW welding is suitable for welding thin plates and is not ideal for thick materials due to temperature limitations.
• 😀 Essential OAW welding equipment includes gas cylinders, a valve tube, a regulator, and a gas torch, along with personal protective equipment like helmets, gloves, and masks.

Q & A

What is OAW welding, and what fuel gases are used in this process?

OAW welding is a method of connecting two or more metals using a high-temperature flame produced by the combustion of oxygen and acetylene. Acetylene is the primary fuel used due to its ability to generate a higher flame temperature than other gases. Propane can also be used as a fuel in place of acetylene.

What is the purpose of the acetylene gas in OAW welding?

Acetylene gas is chosen in OAW welding because it can produce a flame with a high temperature, which is essential for melting the filler and base metals to create a weld.

What are the three types of flames used in OAW welding, and when are they applied?

The three types of flames in OAW welding are: the carburizing flame (which has more acetylene than oxygen and is used for metals that require a reducing atmosphere), the oxidation flame (with more oxygen than acetylene, suitable for copper alloys), and the neutral flame (with equal parts of oxygen and acetylene, used for welding steel, cast iron, and aluminum).

What are the main characteristics of the carburizing flame?

The carburizing flame has a composition with more acetylene than oxygen, which results in a flame with a temperature up to 30,000°C. This flame is not suitable for metals with high melting points like stainless steel.

Why is the neutral flame important in OAW welding?

The neutral flame, created by a balanced ratio of oxygen and acetylene, is crucial for welding a variety of metals, such as steel, cast iron, and aluminum. It is characterized by a yellowish-white inner core and is suitable for joining these metals without causing oxidation or excessive carburization.

What types of metals are suitable for welding with the oxidation flame?

The oxidation flame, with more oxygen than acetylene, is suitable for welding copper alloys and copper. It reaches a temperature of about 33,000°C, which is enough for welding these metals but not for metals that contain a significant amount of iron.

What equipment is commonly used in OAW welding?

The main equipment for OAW welding includes gas cylinders (for storing oxygen and acetylene), valve tubes (for regulating the gas flow), regulators (to maintain working pressure), and gas torches (for mixing and directing the flame). Other equipment includes safety gear such as helmets, gloves, and glasses.

What are the key components of a welding torch in OAW welding?

A welding torch in OAW welding consists of components such as the oxygen and acetylene hose connectors, handle, oxygen and acetylene valves, the mixing chamber, the nozzle head, and the flame output section.

What personal protective equipment (PPE) is necessary for OAW welding?

Personal protective equipment for OAW welding includes safety helmets, gloves, safety shoes, glasses, and masks to protect the welder from heat, sparks, and harmful gases produced during the welding process.

What are the dangers associated with not using proper PPE in OAW welding?

Without proper PPE, welders risk exposure to harmful fumes, intense heat, sparks, and the risk of eye injury from the bright light and ultraviolet radiation generated during the welding process. PPE ensures the welder's safety and health during and after the work.