Metalworking Techniques

Metalworking techniques are used to produce everything from intricate decorative pieces to large structural components. While many methods are similar across different metals, the specific properties of each material play a major role in how you work with it and the final outcome you achieve.

At Bobco, we utilize all of the techniques in order to get the job done properly. If you are looking for metalworking professionals on Long Island, please contact us today.

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When you reach out to us, we can provide you with a no-obligation consultation to go over the various metalworking techniques and what exactly you need completed on your property. From fencing, to gates, to railings, our metalworking team can handle the job! Read on to learn more about these techniques.

4 General Metalworking Techniques

When it comes down to it, there are four general metalworking techniques:

1) Cutting: Cutting is the process of removing material from metal using methods such as milling, routing, and turning, as well as advanced technologies like CNC (computer numerical control) machines. Plasma cutting, which uses a gas-powered torch fueled by gases like argon and hydrogen, can also slice through metal and create precise openings. This technique is widely used in fabrication shops, automotive repair, and construction.

2) Joining: Joining is the process of fusing multiple pieces of metal together, typically using heat through methods like welding or soldering. Welding uses specialized equipment to bond both ferrous and non-ferrous metals, making it ideal for larger projects. Soldering, on the other hand, involves melting a filler metal (solder) to connect pieces—often used for smaller or more delicate work, including precious metals. As metalworking evolves, new technologies continue to expand and refine these techniques.

3) Forming: Forming is the process of reshaping metal without adding or removing material, typically using a combination of heat and pressure. Common forming methods include forging and bending. In forging, the metal is heated and then hammered or shaped into the desired form. Bending involves heating the metal and shaping it—often over an anvil—by striking it to create curves or angles. Tools like the English wheel also allow metalworkers to shape and contour cold metals such as aluminum or steel with precision.

4) Casting: Metal casting is a metalworking technique used to create items such as sculptures, tools, and jewelry. For centuries, metalsmiths have poured molten metal into molds made from materials like stone, plaster, sand, and even bone. This process is both time- and cost-efficient, and it allows for the easy production of multiple identical pieces.

Each provides their own set of benefits and uses.

Cutting Processes & Techniques

Metal must be cut and separated at various stages of the metalworking process to create structures, tools, and other components. A wide range of cutting methods are available, from basic handheld tools to advanced machinery and equipment.

Milling

Milling is a machining process that removes precise amounts of material from a larger workpiece. A milling machine uses a rotating cutting tool that is brought into contact with the material to shape it. Along with the lathe, the milling machine is a fundamental tool in any machine shop, known for producing parts with high precision, consistency, and accuracy.

Turning

Turning is a machining process where the workpiece rotates while a cutting tool moves linearly to remove material. This method allows material to be removed from both the diameter and the length of the piece. Traditionally performed on lathes, turning is now often carried out using CNC machines for greater automation and precision.

Grinding

Grinding is an abrasive process used to remove material from a workpiece, most often during the finishing stages of metalworking. Equipment ranges from handheld angle grinders and bench grinders to advanced CNC machines, varying widely in size and precision. By using abrasive wheels made from materials like stone, diamond, or other inorganic compounds, grinding produces smooth finishes and highly accurate cuts.

Drilling

Drilling is used to create holes in metal with tools such as a drill press, handheld drill, or CNC machine. Applying cutting fluid to the drill bit helps extend tool life, reduce heat buildup, and improve performance. Proper lubrication also ensures cleaner, more accurate holes while minimizing vibration and unsafe operation.

Joining Processes & Techniques

Metal joining uses heat and pressure to combine separate pieces into larger components or complete structures. Welding and riveting are commonly used for heavy-duty applications that must support significant weight, while soldering is typically reserved for smaller, more delicate work such as jewelry and sculptural pieces.

Welding

Welding is a fabrication process that joins materials using heat and, in some cases, pressure. Certain welding methods are suited for indoor use, while others are better performed outdoors depending on conditions and equipment. It is widely used in applications such as shipbuilding, structural fabrication, and even crafting items like swords. There are many types of welding, each designed for specific materials and practical uses.

Soldering

Soldering is a technique for joining metals by melting a filler metal over the surfaces being connected to form a secure bond or electrical connection. A low-temperature alloy is heated and flowed into the joint, fusing the pieces into a single, solid connection. Metalworkers typically use an electric soldering iron or a gas torch to work with materials, including precious metals. Soldering is widely used in plumbing, electronics, and metal fabrication, as well as in the construction and repair of musical instruments.

Riveting

Rivets are permanent mechanical fasteners used to create strong joints or reinforce the structural integrity of a larger assembly. They are especially useful for connecting lightweight components that still require high strength. Before welding became common in structural construction, rivets were widely used in projects like framed buildings and landmarks such as the Eiffel Tower. Prior to installation, rivets are simple smooth metal cylinders with a head on one end.

Forming Processes & Techniques

Metal can be reshaped and formed in either hot or cold conditions. The process you choose depends on the type of metal, the equipment available, and the results you want to achieve.

Forging

Forging is one of the earliest metalworking methods used to shape and form metal. The material is heated in a forge and then hammered or bent into the desired form. A blacksmith might use a hand hammer for smaller pieces or a power hammer for larger work. Forged metals are known for their strength and are most often made from iron or steel.

Roll Forming

Roll forming is a method that continuously bends a long strip of sheet metal as it passes through a series of rollers at room temperature. Compared to other bending techniques, it offers high precision, strong flexibility in design, and can shape metal up to about a quarter inch thick.

Rolling

Rolling is a metal forming process where metal stock is fed through a rolling mill to decrease its thickness or create a consistent profile. This can be done using either hot or cold methods. Hot rolling is commonly used for producing sheet metal and larger components, while cold rolling is better suited for smaller pieces, enhancing strength and improving surface finish so less additional work is needed.

Casting Processes & Techniques

Metal casting is a process in which molten metal is poured into a mold, allowed to cool, and then removed as a solid piece. It’s an efficient method in terms of both time and cost. Common casting techniques include investment (lost wax) casting, die casting, and sand casting.

Sand Casting

Widely used in foundries, sand casting relies on sand to form the mold. The mold is made by mixing sand with a bonding material, such as clay, and shaping it with a gating system. Molten metal is then poured into the mold, where it solidifies into the desired form. This method is the most commonly used in metal casting and is valued for its cost-effectiveness.

Investment or Lost Wax Casting

Investment casting is a technique where molten metal is poured into a mold formed from a wax model. Wax sprues are attached to the model, and a plaster shell is built around it. The assembly is then heated in a kiln to melt away the wax, leaving a hollow mold. After that, molten metal is poured into the mold—often using a vacuum or centrifugal casting method—to create the final piece.

Die Casting

Die casting is a rapid, highly automated process in which molten metal is injected into a mold under high pressure. The mold consists of two precision-machined steel dies, and the metal is forced in at high speed. This method typically uses alloys with relatively low melting points, such as zinc, copper, aluminum, and magnesium.