Seam Welding
Seam welding is a process of joining two similar or dissimilar materials along a continuous seam using electric current and pressure. It is mostly used on metals since they conduct electricity well.
What is Seam Welding?
It is a process of joining two similar or dissimilar materials along a continuous seam using electric current and pressure. It can be broken down into two main techniques: resistance seam welding and friction seam welding. Resistance SW uses a wheel-shaped electrode to make either a series of overlapping spot welds to form a continuously welded and leak-tight seam or a number of spot welds spaced apart – roll-spot welding. Friction SW uses heat generated by friction between two surfaces to join them together.
Types of Seam Welding
There are two main types of it:
- Resistance Seam Welding
- Friction Seam Welding
Resistance Seam Welding
Resistance SW uses a wheel-shaped electrode to make either a series of overlapping spot welds to form a continuously welded and leak-tight seam or a number of spot welds spaced apart – roll-spot welding. The requirements on electrodes and surface finish are the same as for spot welding.
Friction Seam Welding
Friction SW uses heat generated by friction between two surfaces to join them together. The process involves rotating one part while pressing it against another part until the friction generates enough heat to melt the material at the interface.
Applications
Seam welding is used in various industries such as automotive, aerospace, construction, and shipbuilding. It is used in manufacturing fuel tanks, exhaust systems, pressure vessels, pipes, and other components that require high strength and leak-tightness.
Advantages
It has several advantages over other types of welding:
- It produces high-quality welds with good strength and leak-tightness.
- It can be used to join dissimilar materials.
- It can be automated for high-volume production.
- It requires less operator skill than other types of welding.
Disadvantages
It also has some disadvantages:
- It requires expensive equipment.
- It produces less aesthetically pleasing welds than other types of welding.
- It produces more heat than other types of welding which can cause distortion in thin materials.
How to Perform Seam Welding?
The process for performing seam welding varies depending on the type of it being used. However, there are some general steps that are followed in most cases:
- Prepare the surfaces that will be joined by cleaning them thoroughly.
- Clamp the parts together so that they cannot move during the welding process.
- Apply pressure to the parts so that they are held tightly together.
- Apply an electric current or frictional force to generate heat at the interface between the parts.
- Allow the parts to cool down slowly after the weld has been made.
Safety Precautions
- Wearing protective clothing such as gloves, aprons, and face shields to protect against burns and electric shock.
- Ensuring that the welding area is well-ventilated to prevent the buildup of toxic fumes.
- Keeping a fire extinguisher nearby in case of fire.
- Ensuring that the welding equipment is properly grounded to prevent electric shock.
Conclusion
It is a process of joining two similar or dissimilar materials along a continuous seam using electric current and pressure. It is mostly used on metals since they conduct electricity well. Seam welding has several advantages over other types of welding such as producing high-quality welds with good strength and leak-tightness, being able to join dissimilar materials, and requiring less operator skill than other types of welding. However, it also has some disadvantages such as requiring expensive equipment and producing less aesthetically pleasing welds than other types of welding. Proper safety precautions should be taken when performing seam welding to prevent burns, electric shock, and toxic fumes.
