Introduction to Welding Study Guide
- Chester-Joplin-Inverness High School
- Welding Skills Usa
- Introduction to Welding Study Guide
Last Modified: 2013-02-27
Oxy Acetelyne Welding
Plasma Arc Cutting
2 - Plain and low alloy
Uniform Microstructure- low tensile strenght and high ductility
Heat treating lowers yield strength (950 Degrees)
- Control Hydrogen
- Microstructure- as hardness increases- reduce cooling rate w/ higher heat input
- Use multipass procedure
- Increase Preheat-interpass temperatures
CONTAINS BETWEEN 18 &25 % Cr and 8 $ 20% Ni (alloy)
More corrosion resistant, non or slightly magnetic, higher tensile strength, and creep strength cannot be hardened by heat treatment
NOTe: When Welded- 2 forms of degredation- sensitization and microfisureing
Low melding point impurities can be forced to grain boundaries- assoc w/ high restraint.
Occurs just outside the HAZ- Stepped appearance
Joint design critical ( butter the joint prior to welding)
Always use protective gear, face shield, leather gloves.
Non Transferred arc
Workpiec is part of electrical circuit-
arc goes between the work piece and elecrode
Usually starts w/ pilot arc: Ionizes the air jet: which results in plasma
WHEN ARC IS NEAR WORKPIECE- High Frequency current cutting arc exists (the cutting arc ignites)
PAC Pilot ARC- T/F
Low volt, low current, high-frequency inside torch and electrode
Pilot arc does what?
PAC Cutting AMPS-
For light gage steel
can be as low as
High Accident rates occur
Cotton is best
Toxic Coating in Galvanized metal
Material Safety Data Sheet-
Form- lists contents, hazards, precautions that pertain to the material or chemical
Produces hottest flame
Pure O2 Combined w/ Fuel Gases produces what type of flame?
Must be removed prior to welding
J- Groove Usually Machined-
only one base metal prepared- and applied on which joints.
Metal Corrosion occurs when metal is exposed to
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