TIG Welding: Techniques, Joint Preparation, and Defects

TIG final Question the backing strip for welding mild steel up to 3/4" thick should be _________ thick by _____ wide. surfacing welds are used to the most common defect caused by surface contamination is which of the following is a correct statement with regard to cleaning of base metals before welding? wire brushing will not remove a detailed listing of the rules and principles that apply to specific welded products is a mechanical joint preparation is ________ than thermal methods of joint preparation compared to a single v-groove weld, a double v-groove weld . Answer 3/8";3" build up surfaces porosity all metals should be cleaned before welding tight corrosion welding code slower requires half the weld metal lap 60 plug and slot welds are used with _______ joints the groove angle for welding open root welds on plate should be ______ degrees preparing a joint with oxyfuel, plasma arc, or carbon arc cutting processes is known as thermal _________ joint preparation pipe beveling machines are designed to cut and bevel pipe from ________ in diameter 2" to 60" always try to position the weldment so that welding is performed in the ________ position flat angle grinders and end large areas of surface corrosion are best removed by grinders special internal equipment is available for cutting pipe larger than ________ in diameter 54 essential variables identified by a welding procedure specification (WPS) are items that requalifying the welding cannot be changed without ________. procedure most porosity is caused by improper welding techniques and _________. contamination A complete set of fillet weld gauges includes seven individual blade gauges that can 11 measure _______ different weld sizes National The private organization that does not actually prepare standards, but instead adopts American Standards Institute standards that it determines are of value to the public interest is called the ________ (ANSI) which destructive test requires that the sample be pulled until it breaks the failure of the filler metal to penetrate and fuse with an area of the weld joint is known as _________ the results of testing the WPS for a job are recorded on a _________ and kept on file. The most common defects found by a liquid penetrant test are _________ when inspecting a fillet weld, the convexity of a fillet weld will be approximately_______ times the actual face width or the width of the individual surface bead, plus 1/16" A groove is melted into the base metal beside the weld in the condition called ___________ the specifications for acceptable welding and brazing filler metals and fluxes (part C) are contained in section ______ of the American Society of Mechanical Engineers (ASME) Boiler and pressure vessel code (BPVC). in a typical ASME welder qualification test using an open root , if F3 electrodes are used all the way out, the welder qualifies on ___________ on both plate and pipe the gauge shown in the figure above is a(N) ____________ gauge the number / letter designator for fillet welding on plate in the flat position is_______ porosity can be grouped into ______ major types if you have a question about the quality of a weld and your supervisor is not available, who is the next person in the chain of command you should contact prior to welding, the base metal should be examined for conditions that may cause weld defects, and the dimensions should be __________ the walls surrounding the area in which GTAW work is being performed should be painted with paint that is ______ tensile test incomplete joint penetration procedure qualification record (PQR) surface cracks 0.07 undercut II F3 electrodes only fillet weld 1F four general foreman confirmed by measurement non reflective Carbon steel filler metals are identified by AWS specification A5.18 and low - alloy steel A5.28 filler metals are identified by AWS specification ___________ certificate of when filler metal is graded for rigid control fabrication, the purchaser receives________ conformance if you see the label TIG on a welding machine, that machine is considered to be what GTAW kind of a welding machine DCEN . direct current GTAW is almost always performed using electrode negative GTAW commonly uses the same power sources and welding machines used for SMAW the two principal shielding gases used for GTAW are _________ argon and helium for GTAW the electrode is clamped in place inside the torch body by the collet assembly when welding with GTAW in a cross draft situation better shielding is provided by argon higher shielding gas flow rates are required with larger nozzles in the atmosphere near the weld the uv radiation from the GTAW process can ionize oxygen of the various types of tungsten electrodes available the tungsten electrodes that are pure used for AC welding are which welding process is recommended for the repair of a defect on clean magnesium GTAW castings one of the advanced features associated with the GTAW process is the high frequency arc starting intensity controls that provide better in a root pass the penetration is controlled by using the correct torch travel speed and amperage compared to the diameter of the electrode being used stringer beads are generally no 3 more than how many times the diameter of the electrode when making GTAW stringer beads in the vertical position you should use a push angle 15-20 degrees of the major control of bead width is arc length with open v-groove weld the actual number of weld beads will vary depending on the plate thickness when performing cutting or welding operations that produce toxic fumes you must outside the work space wear a respirator that supplies air from in the walking the cup technique, the edge of the torch nozzle (cup) is rested against the base metal GTAW welding uses metal electrodes that are tungsten when terminating a GTAW weld the crater must be filled to the full cross section of the cracking weld to prevent if the tungsten electrode touches the filler metal the welder must clean the electrode when running the fourth bead of a GTAW fillet weld in the 1F position how much of the 1/2 second bead should you overlap a good overlapping bead will have a nearly flat surface when making a GTAW fillet weld in the horizontal (2F) position , pay close attention to torch angles the the travel angle created when the torch is tilted backward so that the tip precedes the push angle torch in the direction of the weld is called a in the freehand technique the GTAW filler rod should be held at what angle to the plate 20 degrees surface when making a GTAW fillet weld in the 1f position the torch must be held at what angle 45 degrees to each plate surface