Tech@Edu

 DESTRUCTIVE AND NON-DESTRUCTIVE TESTING Testing is the physical performance of the operations to determine the qualitative measure to certain properties such as mechanical. Testing aims to determine the quality. Types of Testing- There are two types of testing 1. Destructive Testing 2. Non-Destructive Testing 1. Destructive Testing The destructive testing is the testing in which test piece or specimen is destroyed during the test. After testing the specimen remain no longer to useful for further use. The following destructive test are- a. Tensile testing (TT) b. Bend testing (BT) c. Impact testing (IT) d. Nick-break testing (NBT) e. Hardness testing (HT) f. Etch testing (ET) 2. Non-Destructive Testing The Non-destructive testing is the testing in which test piece or specimen is not destroyed during the test. After testing the specimen is useful for further use. The following non-destructive test are- a. Visual testing (VT) b. Stethoscopic test (ST) c. X-Ray & Gama Ray test d

WELDING AS COMPARED TO CASTING  &  RIVETING 1. Welding is more economical & fast process as compared to riveting & casting. 2. Fabricated mild steel structure are lighter as compared to cast. 3. Welding can join dissimilar metals & thus in a complicated structures & different parts of the structure can be fabricated with different materials as compare to riveting & casting. 4. It’s a noiseless process as compare to riveting & Casting. 5. Cost of pattern making & storing is eliminated. 6. As compared to casting & riveting fewer persons are involved in welding. 7. A welding structure processes a better finish as compared to riveting & casting.  8. Layout of punching or drilling of holes is not required in welding.  9. Welding fabrication involve less inventory as compared to casting since no pattern are involved.  10. Structural shapes are not easily obtained by casting & riveting, can be produced by welding without much difficulty.  11.

Welding Welding is a process of joining similar and dissimilar metals or other material by application of heat with or without application of pressure and addition of filler material. ” Or “Welding is a fabrication process that joins materials, usually metals or thermoplastics, by using high heat to melt the parts together and allowing them to cool, causing fusion .” Welding is distinct from lower temperature  metal-joining  techniques such as brazing and  soldering, which do not melt the base metal.  It is used as permanent fasteners. Welding is  essential process of every manufacturing  industries such as computer industries,  mechanical industries, petroleum industries,  chemical industries etc.