Welding and Cutting Processes 110103f Flashcards
What types of materials are easily spot welded?
Uncoated materials, such as black iron, are easily spot welded, as well as coated materials like galvanized iron
What is a reasonable tip diameter for welding (electrodes)?
A reasonable tip diameter is 1/8 inch plus two metal thicknesses of the gauge of metal being used.
What type of metal requires higher pressure during welding?
Thick metal require higher pressure
What is another name for shielded metal arc welding (SMAW)?
Shielded metal arc welding (SMAW) is also known as stick welding and the electrode is sometimes called a rod
What is gas metal arc welding (GMAW) commonly referred to as?
Gas metal arc welding (GMAW), commonly referred to as MIG welding, is defined as an arc welding process that joins metals by heating them with an electric arc established between a continuously fed filler metal (consumable) electrode and the workpiece.
How does flux cored arc welding (FCAW) work?
Flux cored arc welding (FCAW) uses an arc established between a continuously fed consumable flux cored wire electrode and the work piece.
How does gas tungsten arc welding (GTAW) work?
Gas tungsten arc welding (GTAW), often referred to by the term tungsten inert gas (TIG), is a process in which fusion welding is accomplished by the heat of an electric arc drawn between a non-consumable tungsten electrode and the work
What does the speed of flame propagation refer to?
The speed of flame propagation means the speed at which a flame travels or spreads in premixed gases
What is a carbonizing flame also known as?
The carbonizing flame (also known as carburizing flame or reducing flame) is a flame that rich in acetylene.
What characterizes a neutral flame?
The neutral flame is a flame that has no excess of acetylene or oxygen. It is a perfectly balanced flame
What characterizes an oxidizing flame?
The oxidizing flame is a flame that is rich in oxygen
What are the two types of joints used in brazing?
the butt and lap.
What is an advantage and disadvantage of the butt joint in brazing?
The butt joint has the advantage of single thickness and fit-up is simple.
The butt joint’s disadvantage is that its strength can be limited because the amount of bonding surface area limited.
What is an advantage and disadvantage of the lap joint in brazing?
The lap joint has a larger bonding surface area and can carry larger loads. This joint can be made as strong as the weaker member by using an overlap of at least three times the thickness of the thinner member.
The disadvantage of the lap joint is that the workpiece thickness doubles and can cause stress concentrations at the joint edges.
What is a modified tapered butt joint called?
scarf joint
What do the terms forehand and backhand refer to in welding?
The two terms forehand and backhand refer to the inclination of the heat source in relation to the work piece when welding
How is inclination expressed in welding?
Inclination is expressed in degrees, so when you think of inclination, try to picture a clock face. Each five-minute division on the clock face represents 30 of a circle.
What does the term high-low refer to in joint alignment?
Another term used to describe joint alignment is high-low. If the joint is properly aligned, then there is no high-low. If the material is misaligned, then this is usually indicated by the amount of misalignment followed by the term high-low. For example, the plates have 2.5 mm high-low.
OAW
Oxygen and Acetylen Welding
SMAW
Shielded Metal Arc Welding
GMAW
Gas Metal Arc Welding
GTAW
Gas Tungsten Arc Welding
FCAW
Flux Core Arc Welding
A process using a continuous, solid wire electrode and an inert shielding gas is?
Gas Metal Arc Welding (GMAW)
A process using a continuous, hollow wire electrode with or without shielding gas is?
Flux Core Arc Welding (FCAW)
Joining a light guage material with a SMAW power source may be accomplished using the?
Carbon Arc Welding process
The 3 types of flames available for OAW are?
- Carbonizing
- Neutral
- Oxydizing
Where does a burnback occur?
Between the tip and the mixer
Where does a flashback occur?
Between the mixer and the regulator
Cooper tubing can be used to splice a damaged hose?
False
Braze welding does not involve the melting of the parent materials?
True
Brzing sheet metal requires a filler material made from?
Brass
What a purposes of fluxes in braze welding?
- Clean the oxides
- Protect the weld
List two types of joints used for braze welding
- Butt joint
- Lap joint
Oxy/acetylene and plasma cutting do not actually cut the metal. The metal separates due to?
Oxidization of the metal
The oxygen torch valve on the handle of a combination cutting/welding outfit should be opened ______ for cutting
fully
What type of energy source plasma arc cutting equipment uses?
Electric
What filler wire diameter is used in short-circuiting metal transfer?
Short-circuiting metal transfer uses small diameter filler wires, 0.76 mm (0.023 inch) to 1.1. mm (0.045 inch) and is usually associated with lower current settings and a specific voltage range.
Most mild steel sheet metal welding using the GMAW process is done with the short circuit metal transfer method.
