CWB BOOK 4 Welding Processes & Equipment 2023/2024 latest update

CWB BOOK 4 Welding Processes & EquipmentAWS groups welding processes based primarily on ? - correct answer Mode of energy transfer, and the influence of capillary action in the effecting distribution of filler metals in the joint AWS defines welding as? - correct answer A joining process producing coalescence of materials by heating them the 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. - correct 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? - correct answer Flux shielding, Gas shielding Which elements don't conduct any electricity at room temp? - correct answer Oxygen, Nitrogen and Carbon Dioxide How is a welding ARC formed? - correct 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? - correct answer No What would be 2 examples of Autogenous weld? - correct answer Gas Tungsten ARC & Electron Beam welding Is filler metal used in Autogenous weld? - correct answer No All the electrical energy supplied by the power source is convered into? - correct answer Heat (current * voltage) ARC efficiency for some of the commonly used ARC welding processes is ? - correct answer Submerged arc welding (90-95%) Shielded metal arc, gas metal and flux cored arc welding (65%-85%) Gas tungsten arc welding (20-45%) Higher arc efficiency usually means for a given arc energy? - correct 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? - correct 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. Describe the characteristics of DCEN & DCEP & AC with heat balance and penetration? - correct answer Define Active Flux ? - correct answer (Submerged Arc Welding) A flux formulated to produce a weld metal composition dependent on the welding parameters, especially arc voltage. Define Alloy? - correct answer A substance with metallic properties and and composed of two or more chemical elements of which at least one is a metal Define Alloy Flux? - correct 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 ? - correct 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? - correct answer The deflection of an arc from its normal path due to magnetic forces. Define ARC Force? - correct answer The axial force developed by arc plasma Define ARC Length? - correct answer The distance from the tip of the welding electrode to the adjacent surface of the weld pool Define Arc Plasma ? - correct answer A gas heated by an arc to at least a partially ionized condition, enabling it to conduct an electric current Define Arc Voltage? - correct answer The electrical potential between the electrode and the work piece Define ARC welding? - correct answer A group of welding processes producing coalescence of metal by heating the with an arc, with or without the application of pressure, and with or without the use of filler metal. Define Arc Welding Electrode ? - correct answer A component of the welding circuit through which current is conducted and that terminates at the arc. For GTAW what polarity most often used ? - correct answer DCEN With GTAW why is DCEN mostly used? - correct answer The life of the tungsten electrode and the weld bead has reduced life and penetration. What is the polarity of choice for GMAW? - correct answer DCEP Why is DCEP the polarity of choice for GMAW? - correct answer It has greater penetration What is HICC? - correct answer Hydrogen induced Cold Cracking