Forge

A forge is a special fire.

It heats up metal. This makes the metal soft. It is easy to shape now.

A smith uses tools to work. They use tongs to hold the hot metal. They use a hammer to hit it.

This changes the shape.

The metal sits on an anvil. An anvil is a heavy block. It acts like a workbench. It helps the smith work.

Sometimes the metal is too hot. The smith puts it in water. This is called a slack tub. It cools the metal fast.

Forging is a very old skill. It has been used for thousands of years. It helps make many tools.

A forge is a special kind of hearth.

A smith uses it to heat metal. This makes the metal malleable. That means it is soft enough to shape.

To make a hot fire, smiths use fuel. They might use charcoal or coal. They also use a tuyere. This is a pipe that lets air into the fire. A bellows or a blower pushes air through the pipe. More air makes the fire burn much hotter.

Some smiths use a gas forge. These use propane or natural gas. They are very easy to use. They also make a clean fire.

Once the metal is hot, the smith moves it. They use tongs to hold the metal safely.

They place the metal on an anvil. An anvil is a heavy metal block. It acts like a workbench. Most anvils have a steel face. This face is very hard. It helps the hammer's power push back into the metal. This is called rebound.

After shaping the metal, the smith may use a slack tub. This is a large container of water. It cools the metal quickly. This helps to harden the steel.

A forge is a special kind of hearth used to heat metal. It can also mean the entire workshop where a smith works. This place is called a smithy. A smith uses the heat to make metal malleable. This means the metal becomes soft enough to shape. Without this heat, the metal would be too hard to move. The forge is the heart of the whole workshop.

Most forges work by using fuel and air to create intense heat. A smith might use charcoal, industrial coke, or bituminous coal.

To make the fire hotter, they use a pipe called a tuyere. This pipe lets air enter the fire through a tool called a bellows or a blower. More air makes the fuel burn faster and much hotter. In a coal forge, the smith carefully manages the shape of the fire. They might keep a ring of damp coal around the center. This helps the middle part cook into coke first.

Some smiths use different kinds of forges for different jobs. A gas forge uses propane or natural gas instead of coal. These are very easy for beginners to use. They also produce a very clean and consistent fire.

There are also finery forges. These are water-powered mills. They are used to refine pig iron into wrought iron. Forging tools have changed over thousands of years. They have evolved into many different shapes for many tasks.

Once the metal is hot, the smith must move it carefully. They use tongs to hold the workpiece safely. The metal is then placed on an anvil. An anvil is a heavy metal workbench. A real anvil must have a hard tool steel face. This face provides something called rebound. This means it pushes 50 to 99% of the hammer's energy back into the metal.

Anvils often have holes like the hardy hole or the pritchel hole. These holes hold special tools for the smith.

After the smith shapes the metal, they may need to cool it. They use a large container of water called a slack tub. This is used to quench the metal. Quenching can harden the steel or cool it so hands can touch it.

Some smiths use oil or salt brine instead of plain water. This is often called a quench tank in tool-making. Forging can also happen with huge machines. In drop forging, a heavy hammer hits the metal with great force. This force can be between 11,000 and 425,000 pounds.

A forge is a specialized type of hearth designed to heat metals to extreme temperatures. It can also refer to the entire workshop where this work happens, which is called a smithy.

The primary purpose of a forge is to make a workpiece, or the piece of metal being worked, malleable. When metal reaches a specific temperature, it becomes much easier to shape through forging. Heating also prevents work hardening, a process where metal becomes harder and more brittle as it is worked.

By controlling heat, a blacksmith can change the metallurgical properties of the metal, such as through annealing, tempering, or hardening.

To create this intense heat, a smith must carefully manage the relationship between fuel and air. Most traditional forges use bituminous coal, industrial coke, or charcoal as fuel.

The design relies on a hearth, which is the container for the burning fuel. A key component is the tuyere, a pipe that allows air to be forced into the fire. This air is provided by a blower or a set of bellows. When more air is introduced through the tuyere, the fuel consumes faster and burns much hotter. In a typical coal forge, the smith maintains a "coke heart," which is a ball of burning coke located in or above a firepot. The smith manages the fire's shape by surrounding the hot core with layers of unburnt coke or damp, tightly packed raw coal. This structure ensures the coal "cooks" into coke before burning directly.

There are several distinct types of forges used depending on the desired outcome. A gas forge uses propane or natural gas instead of solid fuel. These forges often feature a cylindrical chamber lined with refractory materials, such as a ceramic thermal blanket or hard castable ceramic. A burner tube mixes the gas and air, which is then ignited at the tip. While gas forges are easier for novices to use and provide a clean, consistent heat, they are less versatile than coal forges. They cannot easily be reshaped to accommodate very large or oddly shaped pieces.

Other specialized versions include the finery forge, which is a water-powered mill used to refine pig iron into wrought iron.

Once the metal is heated, the blacksmith uses specific tools to manipulate it. Tongs are essential for holding the hot workpiece securely; a smith may own twenty or more pairs in different shapes, such as flat, rivet, or gad tongs. The metal is then moved to an anvil, which serves as the blacksmith's workbench. A high-quality anvil is made of cast or wrought iron with a tool steel face welded on. This steel face is vital because it provides "rebound." Rebound is the ability of the anvil to project between 50% and 99% of the hammer's energy back into the workpiece.

Anvils also feature specialized holes: the square hardy hole for holding tools and the smaller pritchel hole, which can be used as a bolster for punching holes.

Various hammers are used to strike the metal, ranging in weight from half an ounce to nearly 30 pounds. These include hand hammers like the ball-peen or cross-peen, as well as heavy sledgehammers used by a striker.

Other tools include fullers, which are used to create grooves or hollows, and chisels made of high carbon steel. Chisels are specifically designed with a hardened, tempered cutting edge and a softer head to prevent cracking under impact. Blacksmiths use both hot chisels for heated metal and cold chisels for working metal at room temperature.

After the shaping process, the metal often requires rapid cooling, a process known as quenching. This is done in a slack tub, which is a large container of water. Quenching can be used to harden steel or to cool the work so it can be handled by hand. In specialized tool-making or bladesmithing, this is often called a quench tank, and the smith might use oil or a salt brine instead of plain water. The term "slack" likely comes from the word "slake," meaning to slake the heat.

In modern industrial settings, forging can move beyond the handheld hammer to heavy machinery. One such method is drop forging, which uses a power hammer to shape complex parts. These hammers can be powered by hydraulics, air, or mechanics. The striking force of a drop hammer is immense, ranging from 11,000 to 425,000 pounds. The workpiece is placed between dies, and the impact forces the metal to conform to the die's shape. Sometimes, excess material is pressed out of the sides, creating what is known as flash, which is later trimmed away from the finished part.