Types of Metals
The scientific study of metals
Metallurgy
What is considered the electrode in the SMAW/Stick welding process?
The flux coated stick electrode that is placed in the stinger
- warping of the material
- often caused by excessive heat in contained area
Distortion
- Often used in outdoor settings
- Post-weld clean - up required
- No shielding gas required
- Contains flux on rod that acts as shield
Stick or SMAW welding process
name the four welding positions
flat
horizontal
vertical
overhead
A metal with one or more elements added to it.
- a metal that is not purely one metallic element
Alloy
What is considered the electrode in GMAW/MIG welding process?
The consumable wire fed via spool
- A groove melted into the base metal adjacent to the toe or root of a weld and left unfilled by weld.
- valley at the edges of the weld
undercut
- Often used in manufacturing
- Medium amount of post-weld cleaning required
- More prep work involved prior to welding
- shielding gas required
- electrode is a wire fed via spool
GMAW or MIG welding process
Name the gas that we will be using MOST OFTEN for our MIG welding machines
75%/25%
- Alloys of steel that contain higher levels of chromium which makes them more resistant to corrosion and rust.
- Used often in facilities involving food grade work
Stainless Steel
The electrode lead will be connected to the ______ terminal for Direct Current Electrode Positive,
while the ground lead will be connected to the ______ terminal.
positive, negative
- Cavity type discontinuities formed by gas entrapment.
- crater like holes formed on the face of the weld or internally.
Porosity
Tig welding stainless steel uses which polarity
Direct current electrode negative
name the two most common joint types created by our flat bar in this shop
T-Joint
lap Joint
- Iron & Carbon Alloy (combination)
- Higher carbon content that other steels
- High strength and hardness
- Non-corrosive resistant, susceptible to rust
Carbon Steel
The electrode lead will be connected to the ______ terminal for Direct Current Electrode Negative,
while the ground lead will be connected to the ________ terminal.
Negative , Positive
pieces of slag are contained inside of the weld
- often used indoors as it is a sensitive process
- inert shielding gas required and is sensitive to outdoor weather forces
- immense prep work required on base metal
- almost no post-weld clean up
- used often for sanitary and food grade environments
Tig or GTAW process
Name the gas we will use MOST often for our TIG welding machines
100% oxygen
- soft
- silver
- high thermal and electrical conductivity
Aluminum
What is the electrode in GTAW/TIG welding process?
The Tungsten
- Joint penetration that is less than the thickness of the weld joint.
- One or both sides of the weld are not full penetrating the base metal
Incomplete Joint Penetration
Stick welding carbon steel uses what polarity
Direct current electrode negative
What metal is highly prone to "drawing" towards the heat source (electrode) when welding?
Stainless steel