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Welding history

Classification of welding

Effect of welding speed

Welding defects

Types of welding joints

Welding position

Welding electrodes

Types of welding flame

Welding flux

Welding techniques

Welding symbol

Welding edge preparation

Advantages of welding joints

Thermal properties of metal

Welding safety

Types of welds



Welding history

There are many different types of welding process in the welding history. The term welding, whose origin is identical with that of the word  well in the sense of welling or boiling up. In the previous time known to have been familiar to some extent with the blowpipe or flame torch, but there was no record of their having ever applied it to the joining of metal by fusion process. The water-gas welding process was applied in the end of 19th century. The flame which is produced from water-gas replaced the blacksmith s hearth as a mean of heating the metal and welded the metal but this is first welding. Another type of welding is the more modern types the termed cast-welding. In this method the molten metal pouring into a mould which has runner at the point where the casting had failed to flow or wherever there was a fractured place. The molten iron poured in until it was fluid everywhere around the edge of the job and runner was stopped up, then the iron was allowed to cold in the mould. This welding process can be said modern fusion weld process, but this is slightly high cost process than other types of welding.

At that time the oxy-acetylene welding process discovering was the most vital importance invention in the welding history. That awardable invention gone to Mr. Edmund Davy in 1836. This type of welding discovery was known to chemists a long time before it became a factor of economic importance to the world.

Short history of welding

Willson and Moisson had developed a method of making calcium carbide(CaC2) in the year of 1891. In 1895 a Frenchman had discovered the another type of welding process that equal parts of acetylene and oxygen burned together gave a higher temperature.

Another welding had been happening in 1881 by Mr. de Meritens. During his experimental works he faced with the necessity of joining together certain parts of electrical storage batteries. He placed the work-piece on a table and it connected with the positive pole of the source of current , the other pole connected a carbon rod which has kept on operator hand. Then he strike on the work, at that time first produced a arc and some heat was generated. Finally he made a fused the metallic lead of battery plate. The first job lead container which was used for some chemical container was produced with this type of arc welding process.

Elihu Thomson had made first electric welding machine patent in the year of 1886, which was big type of welding machine. His process was usually called butt-joint welding. He had also modify the other welding system later because the jaw which was used for griping the job the piece got too much hot. So he developed water cooled jaw system.

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Welding history