Guide to Lead Welding

Lead welding, also known as lead burning, is a specialized type of welding used primarily for joining lead sheets and lead-based products. It is commonly used in industries such as construction, plumbing, and roofing.


The following equipment is needed for lead welding:

Preparing the Lead Surface

Before starting the welding process, it is important to properly clean and prepare the lead surface. This can be done by using a wire brush or sandpaper to remove any debris or oxidation.

Applying Flux

Once the lead surface is prepared, a thin layer of flux should be applied. Flux helps to remove any remaining oxidation on the surface of the lead and helps to ensure a strong, durable weld.

Starting the Weld

The lead burning torch should be ignited and the flame adjusted to a small, steady size. The flame should be directed at the joint, melting the lead solder as it is applied. The lead solder should be applied to the joint, melting and bonding with the lead surface.

Filler Material

Lead welding typically does not require the use of filler material. The molten lead itself acts as the filler metal, filling the joint and forming a solid bond upon solidification. However, in certain cases where additional material is needed, compatible lead-based filler rods can be used to achieve a stronger weld joint.

Finishing the Weld

Once the welding process is complete, the joint should be allowed to cool slowly. This helps to prevent any cracking or warping of the lead surface. Once cooled, any excess solder or flux can be removed using a wire brush or sandpaper.

What precautions should be taken when lead welding?

When working with lead and lead-based products, it is important to take appropriate safety precautions. This includes wearing heat-resistant gloves and protective eyewear, as well as working in a well-ventilated area.

It is also important to take certain precautions when lead welding to protect yourself from potential hazards, such as lead fumes and burns. Here are some precautions that should be taken when lead welding:


Lead welding is a specialized type of welding used primarily for joining lead sheets and lead-based products. It requires specific equipment and safety precautions, but with proper technique, can produce strong, durable welds.

Some Questions and their Answers

Can you Weld Lead to Steel

Welding lead to steel can be a challenging task due to the significant differences in the properties of these two materials. Lead is a soft and low-melting metal, while steel is a strong and high-melting alloy.

It is generally not recommended to directly weld lead to steel using conventional welding methods, such as arc welding or gas welding, due to the mismatch in their melting temperatures and metallurgical compatibility. The high heat required for steel welding can result in the melting and deformation of the lead, leading to weak and unreliable welds.

However, there are alternative methods for joining lead and steel, such as mechanical fastening or adhesive bonding. Mechanical fastening involves using suitable fasteners, such as screws or rivets, to connect lead and steel components securely. Adhesive bonding involves using specialized adhesives formulated to provide strong and durable bonds between lead and steel surfaces.

When considering welding or joining lead to steel, it is essential to evaluate the specific application requirements, including factors such as structural integrity, chemical resistance, and thermal expansion compatibility. Consulting with experts or engineers familiar with lead and steel welding can provide valuable guidance on the most suitable joining method for your particular needs.

Can you Weld Lead with a Blowtorch

Lead can be welded using a blowtorch, specifically an oxyacetylene torch, which provides the necessary heat for melting lead and creating a weld. Welding lead with a blowtorch can be suitable for smaller lead welding projects or repairs.

When welding lead with a blowtorch, it is important to follow proper safety precautions and use the appropriate personal protective equipment, such as gloves and safety glasses, to protect against heat and molten metal.

It is important to note that lead has a relatively low melting point, so caution should be exercised to avoid overheating or overheating adjacent materials that may be sensitive to high temperatures.

What temperature do you Weld Lead?

Lead welding typically requires a temperature range between 327°C (621°F) and 343°C (649°F). This temperature range corresponds to the melting point of lead, which is approximately 327.5°C (621.5°F). It is important to maintain the lead at a sufficiently high temperature to ensure proper fusion and bonding during the welding process.

As with any welding process, it is recommended to refer to welding procedure specifications (WPS) or consult with experts in lead welding to determine the specific temperature requirements for the particular lead welding application and to ensure optimal results.

What gas is used for lead welding?

When it comes to lead welding, an oxyacetylene flame is commonly used as the heat source. In this case, the gases used are oxygen (O2) and acetylene (C2H2).

Oxygen is essential for the combustion of acetylene, providing the necessary heat intensity for lead welding. Acetylene, on the other hand, is a fuel gas that burns in the presence of oxygen to produce a high-temperature flame. The combination of oxygen and acetylene creates a highly controllable and versatile flame that can reach the temperatures required for lead welding.

It is important to ensure the correct gas mix and appropriate gas pressures when using an oxyacetylene torch for lead welding. Following the manufacturer's instructions and safety guidelines is crucial to maintain the desired flame properties and ensure safe welding operations.

Please note that alternative fuel gases, such as propane or natural gas, are not commonly used for lead welding due to their lower flame temperature and different combustion properties compared to acetylene.

What Flame for Welding Lead?

When welding lead, it is important to use a specific type of flame known as a reducing flame. The reducing flame is slightly carburizing and helps minimize oxidation during the welding process, ensuring clean and high-quality welds.

The reducing flame is achieved by adjusting the gas and oxygen flow rates of an oxyacetylene torch. The torch should be set to have a higher acetylene-to-oxygen ratio, with a small excess of acetylene, compared to a neutral flame used for other welding applications.

The reducing flame has a distinct appearance characterized by a short, bushy inner cone surrounded by a larger, lighter-colored outer cone. The inner cone contains the highest heat concentration and is where the welding action takes place. The outer cone serves as a protective envelope around the inner cone, preventing excessive oxidation and maintaining a reducing atmosphere.

It is important to maintain the reducing flame during lead welding to prevent the formation of oxides on the lead surface, which can lead to weak and compromised welds. Proper control and adjustment of the torch settings are necessary to achieve and maintain the desired reducing flame throughout the welding process.

Always follow the manufacturer's guidelines and safety precautions when working with an oxyacetylene torch and adjusting flame settings. Seek training or guidance from experienced professionals to ensure proper flame setup and optimal welding results when working with lead.

How strong is a Lead Weld?

The strength of lead welds can vary depending on various factors, including the welding technique used, the skill of the welder, and the specific application. Lead is a relatively soft and low-strength material, so lead welds may not possess the same level of strength as welds on stronger metals.

Lead welds typically exhibit good bonding and fusion when the welding process is performed correctly. The molten lead fills the joint and solidifies, creating a solid connection between the welded components.

However, it is important to note that lead is prone to deformation and low ductility, which can affect the overall strength of the weld.

The strength of lead welds is often sufficient for many applications where the primary requirement is sealing or joining lead components.

Lead welding is commonly used in plumbing, roofing, and specialized applications involving lead-based structures or components. In such cases, the strength of the weld is typically suitable for the intended purpose.

However, it is essential to consider the limitations of lead as a material when assessing the strength of lead welds. Lead is a relatively soft metal with low tensile strength, and it may be susceptible to deformation or failure under certain loads or stress conditions.

If high strength or load-bearing capacity is a critical requirement, alternative welding methods or the use of stronger materials may be necessary.

It is recommended to consult with experienced professionals or engineering experts for specific applications requiring lead welding to determine the suitability and strength requirements of lead welds. They can provide guidance on appropriate welding techniques, joint design, and potential reinforcement methods to achieve the desired strength and reliability in lead welds.