Welding

By: Ryan Black

Areas Covered

• Types of welding processes

• Types of welding joints

• Types of welds and weld symbols

Types of Welding Processes

• Brazing

• Oxyfuel gas welding

• Arc welding

• Mig welding

• Tig welding

• Resistance welding

• Electronic beam welding

Brazing

• The process that joins metals by adhesion with low melting point filler metal

• Parent metal is not melted

• Copper is common filler metal

Oxyfuel Gas Welding

• Process in which the heat generated by burning gases cause the parent metal to melt and fuse into one piece

• Sometimes a filler metal is used• The most common oxyfuel process used is

oxyacetylene welding

Arc Welding

• Process in which heat is produced by an electric arc between a welding electrode and the parent metal

MIG Welding

• Metal inert gas welding• A gas shielded arc welding

process which creates a clean weld

• The electrode is a filler wire that is fed ito the weld automatically

• Metals ¼” thick or thicker

TIG

• Tungsten inert gas• Gas shielding arc welding

process which creates a clean weld

• Uses a tungsten electrode to maintain intense heat and a metal filler rod can be added

• Metal ¼” or less • Most aluminum is TIG welded

Resistance Welding

• An electric current is the source of heat.

• Pressure is applied to bring the parts together at the point of weld

• Common type of resistance welding is spot welding

Induction Welding

• Heat is generated by the resistance of the metal parts to flow of an induded electric current

• Can be done with or with out pressure

Electronic Beam Welding• A high intensity beam of

electrons focused in a small area at the surface to generate heat for welding

• This process provides greater control over other processes

• Done in a vacuum to make a cleaner weld

• Small amount of distortion because heat is concentrated in a small area

Welding Joints

• There are five basic joints

• Butt

• Corner

• Tee

• Lap

• edge

Common Weld Types

Weld Symbols

Symbols and Their

Interpretation

Bibliography

• Drafting and Design Seventh Edition, pg. 779-789