Welding is a process that joins metals through heating and melting. There are several types of welding processes including brazing, oxyfuel gas welding, arc welding, MIG welding, TIG welding, resistance welding, and electronic beam welding. Each process varies in how heat is generated and applied. Common welding joints include butt, corner, tee, lap, and edge joints. Weld symbols are used to indicate welding specifications and requirements on technical drawings.

1. Welding
By: Ryan Black

2. Areas Covered
• Types of welding processes
• Types of welding joints
• Types of welds and weld symbols

3. Types of Welding Processes
• Brazing
• Oxyfuel gas welding
• Arc welding
• Mig welding
• Tig welding
• Resistance welding
• Electronic beam welding

4. Brazing
• The process that joins
metals by adhesion with
low melting point filler
metal
• Parent metal is not
melted
• Copper is common filler
metal

5. 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

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

7. 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

8. 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

9. 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

10. 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

11. 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

12. Welding Joints
• There are five
basic joints
• Butt
• Corner
• Tee
• Lap
• edge

13. Common Weld
Types

14. Weld Symbols

15. Symbols and
Their
Interpretation

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