Modern Welding Technology

Welding Technology:

Welding is extremely useful and popular industrial process. Welding Technology is not only used in industries, but they are also used in small works and things needed for day to day life. Here, in this article, we start with some basics of welding. Through this series, we will move towards details of Welding Technology.

Welding:

Welding is joining process. It is mainly used on thermoplastic materials. Thermoplastic means, the material which gets plastic when heated and becomes solid after cooling is done. So, Welding is mainly meant for Metals.

Welding, joining of metal parts, is achieved through different means. Depending on these methods, welding can be divided into 4 main types.

• Electric Resistance Welding (ERW).
• Fusion Welding.
• Pressure Welding also called as Forge Welding.
• Brazing, Soldering.

Important Types of Welding:

1. Electric Resistance Welding (ERW):

Electric Resistance Welding (ERW) is achieved by passing high current through workpiece. Two parts to be joined are held connected by holding assembly. Current which passes through the body of parts faces maximum resistance at the point of contact. Resistance increases the temperature at that point and metal melts at that point. Joining of material is achieved after cooling of this spot.

Spot Welding is one of popular implementation of Resistance Welding. Spot welding is not fluid proof welding but resistance welding can be used for making fluid proof parts like metal tanks. For that, holding electrodes are replaced by roller electrodes, also called as Seam Welding.

2. Fusion Welding:

Fusion, name explains the welding. Fusion means melting. In this process, the edges of the parts to be joined are heated to melt. They are joined when cooling is done. Filler materials and pressure can be applied but not compulsory. It totally depends upon the specific process and part needs.

More evolved version of this are Gas Welding, Laser Beam Welding, Electron Beam Welding etc.

3. Pressure Welding OR Forge Welding:

Unlike Fusion Welding, heat is not necessary in Pressure/Forge Welding. It may or may not be there. Here, joining of metals is done by applying pressure. Blacksmith can be good example for this type. Metal joining can be achieved by hammering metal parts.

4. Soldering, Brazing:

This welding process is mostly the weakest kind of join within above described. In this welding, parts to be joined are not brought to molten state. Instead, filler material is melted in and applied at join. Usually, filler material has low melting point. It is melted using torch. It is popular joining process for electronics related things. This process can be very well automated.

These are main types of welding. These types, depending on work needs, are developed and evolved into much finer welding processes like TIG welding, MIG Welding, Underwater Welding and many more.

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