API 650 & Section IX

API-650 = American Institute of petroleum 

Plastic Welding or Pressure Welding :  When the metal piece acquires plastic state on heating, external pressure is applied. In this process, externally applied forces play an important role in the bonding operation. “A group of welding processes which produces coalescence at temperatures essentially below the melting point of the base materials being joined without the addition of a filler metal” is Pressure Welding Process. Without melting the base metal, due to temperature, time and pressure coalescence is produced. Some of the very oldest processes are included in solid state welding process. The advantage of this process is the base metal does not melt and hence the original properties are retained with the metals being joined. Fusion Welding or Non-Pressure Welding :  The material at the joint is heated to a molten state and allowed to solidify. In this process the joining operation involves melting and solidification and any external forces applied to the system do not ...

                DEFINITION OF WELDING:- Welding is the process of joining together two pieces of metal so that bonding takes place at their original boundary surfaces. When two parts to be joined are melted together, heat or pressure or both is applied and with or without added metal for formation of metallic bond.                 NEED FOR WELDING:- With ever increasing demand for both high production rates and high precision, fully mechanized or automated welding processes have taken a prominent place in the welding field. The rate at which automation is being introduced into welding process is astonishing and it may be expected that by the end of this century more automated machines than men in welding fabrication units will be found. In addition, computers play critical role in running the automated welding processes and the command...

Dear viewer please read my contents and improve your knowledge about storage tank & silo ...if you want to gain more knowledge please follow my page and motivate me.....  Now i am going to describe about the types of welding.  there are following types of welding methods, those are given below.                                  TYPES OF WELDING   Welding process can also be classified as follows:  ( 1) Gas Welding (i)   Oxy Acetylene Welding.    (ii)   Oxy Hydrogen Welding. (iii)   Pressure Gas Welding. (2)  Arc Welding (i) Carbon Arc Welding. (ii) Shield Metal Arc Welding. (iii) Submerged Arc Welding. (iv)    Metal Inert Gas Welding. (v) Tungsten Inert Gas Welding.    (vi)   Electro Slag Welding.    (vii)    Plasma Arc Welding.