Welding Techniques and Lathe [www.mastercnc.org]

After yesterday I was discussing the insert lathe, now I try to discuss the terms of welding.If we talk about technique welding work, it seemed difficult because there are several theories that have under our control and require a long time.
Here's a quick review.
Welding technology has made remarkable process in recent years,and is applied to numerous industrial fields.Although there are many ways to join materials,welding is thought to be one of the most important.

The definition of welding is Joining materials with the aid of heat and or pressure,adding suitable filler materials necessary.
The oldest metal joining method used for more than 3.000 years,is forging{metals in hot condition joined and formed with hammer blows}.An iron ornament apparently made by forging was found in the golden coffin of the ancient Egyptian king Tutankhamen.
In the 19th century,electricity and gas combustion energy were first put into practice industrially.Since then,using such well-concentrated energy source,various welding and cutting processes have developed substantially.
Maybe there who want to share the experience, that's my hope.