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CWB BOOK 4 Welding Processes & Equipment
By ExamNavigator
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CWB BOOK 4 Welding Processes & Equipment
- AWS groups welding processes based primarily on ?
Answer: Mode of energy trans- fer, and the influence of capillary action in the effecting distribution of filler metals in the joint
- AWS defines welding as?
Answer: A joining process producing coalescence of materials by heating them the welding temperature with, or without the application of pressure or by the application of pressure alone, and without or without the use of filler metal.
- AWS welding processes are grouped into which major following categories.
Answer: ARC welding (AW), Solid state welding (SSW), Resistence welding(RW), Oxyfuel gas welding(OFW), Soldering(S), Brazing(B), other welding welding, Allied processes (such as cutting and thermal spray.)
- What are the 2 main methods of ARC shielding welding?
Answer: Flux shielding, Gas shielding
- Which elements don't conduct any electricity at room temp?
Answer: Oxygen, Nitro- gen and Carbon Dioxide
- How is a welding ARC formed?
Answer: High Current is forced to flow across a gap between 2 electrodes at relatively low voltage
- Does ARC welding require application of pressure to cause fusion?
Answer: No
- What would be 2 examples of Autogenous weld?
Answer: Gas Tungsten ARC & Electron Beam welding
- Is filler metal used in Autogenous weld?
Answer: No
- All the electrical energy supplied by the power source is convered into?
Answer: -Heat (current * voltage)
- ARC efficiency for some of the commonly used ARC welding processes is
?
Answer: Submerged arc welding (90-95%)
Shielded metal arc, gas metal and flux cored arc welding (65%-85%) Gas tungsten arc welding (20-45%) 2 / 3
- Higher arc efficiency usually means for a given arc energy?
Answer: A greater amount of weld metal is deposited and the work piece cools at a comparatively slowly rate.
- What are the 4 steps in any welding setup of the continuous drop in voltage from the lower
most point of contact to the work piece?
Answer: There is a drop in voltage over the electrode extension,
the volt drop over the arc length,Next to the cathode spots are small thin gaseous regions called the anode drop zone and cathode drop zone, Between the 2 drop zones there is a arc column with a relatively small drop in voltage.
- Define Active Flux ?
Answer: (Submerged Arc Welding) A flux formulated to produce a weld metal composition dependent on the welding parameters, especially arc voltage.
- Define Alloy?
Answer: A substance with metallic properties and composed of two or more chemical elements of which at least one is a metal
- Define Alloy Flux?
Answer: (Submerged Arc Welding) A flux containing ingredients reacting with the filler metal to establish a desired alloy content in the weld metal
- Define Alternating current ?
Answer: Current flow in an electrical circuit where its direction (and therefore direction of electron flow) continually reverses itself, usually at a predetermined frequency. The positive half and negative half of the AC sine wave together represent one complete cycle of alternating current.
- Define ARC Blow?
Answer: The deflection of an arc from its normal path due to magnetic forces.
- Define ARC Force?
Answer: The axial force developed by arc plasma
- Define ARC Length?
Answer: The distance from the tip of the welding electrode to the adjacent surface of the weld pool
- Define Arc Plasma ?
Answer: A gas heated by an arc to at least a partially ionized condition, enabling it to conduct an electric current
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