VẼ CƠ KHÍ Chuong 2b soudage welding 2

Chapter 2bUnremovable Fastener Mechanical Assembly : Adhesion, Welding and Riveting... Middle Ages Welding can trace its historic development back to ancient times.. Small gold circular

Chapter 2b

Unremovable Fastener Mechanical Assembly : Adhesion, Welding and

Riveting

Middle Ages

Welding can trace its historic development back to ancient times

1/-The earliest examples come from the

Bronze Age Small gold circular boxes

were made by pressure welding lap joints together It is estimated that these boxes were made more than 2000 years ago

2/-During the Iron Age the Egyptians and

people in the eastern Mediterranean area learned to weld pieces of iron together Many tools were found which were made approximately 1000 B.C

3/-During the Middle Ages, the art of

blacksmithing was developed and many items of iron were produced which were welded by hammering It was not until the 19th century that welding, as we know it today was invented

WELDING: gase & arc electrode

Welding Symbol ISO and AWS (American Welding Society)

SUPPLEMENTARY SYMBOLS

GAS WELDINGThe discovery of acetylene in 1836

STANDARD ELECTRICAL ARC WELDING:, TIG, MIG, MAG, FCAW MACHINE

In 1890, C.L Coffin of Detroit was

awarded the first U.S patent for an arc

welding process using a metal

electrode

MODERN ELECTRICAL ARC WELDING : TIG, MIG,

MAG, FCAW MACHINE

1 GTAW :Gas Tungsten Arc Welding

-TIG : Tungsten Inert Gas welding

2 GMAW Gas metal arc welding

-MIG: Metal Inert Gas

-MAG: Metal Active Gas

3 FCAW - FCA Flux-Cored Arc Welding

-SMAW: Shield Metal Arc Welding

4 EGW Electro Gas Welding

5 SAW (Submerged Arc Welding)

6 PAW (Plasma Arc Welding)

TIG:

FCAW - FCA

EGW 12mm to 75mm

SAW