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TIG final
Question | Answer |
---|---|
the backing strip for welding mild steel up to 3/4" thick should be _________ thick by _____ wide. | 3/8";3" |
surfacing welds are used to | build up surfaces |
the most common defect caused by surface contamination is | porosity |
which of the following is a correct statement with regard to cleaning of base metals before welding? | all metals should be cleaned before welding |
wire brushing will not remove | tight corrosion |
a detailed listing of the rules and principles that apply to specific welded products is a | welding code |
mechanical joint preparation is ________ than thermal methods of joint preparation | slower |
compared to a single v-groove weld, a double v-groove weld . | requires half the weld metal |
plug and slot welds are used with _______ joints | lap |
the groove angle for welding open root welds on plate should be ______ degrees | 60 |
preparing a joint with oxyfuel, plasma arc, or carbon arc cutting processes is known as _________ joint preparation | thermal |
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 |
large areas of surface corrosion are best removed by | angle grinders and end 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 cannot be changed without ________. | requalifying the welding 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 measure _______ different weld sizes | 11 |
The private organization that does not actually prepare standards, but instead adopts standards that it determines are of value to the public interest is called the ________ | American National Standards Institute (ANSI) |
which destructive test requires that the sample be pulled until it breaks | tensile test |
the failure of the filler metal to penetrate and fuse with an area of the weld joint is known as _________ | incomplete joint penetration |
the results of testing the WPS for a job are recorded on a _________ and kept on file. | procedure qualification record (PQR) |
The most common defects found by a liquid penetrant test are _________ | surface cracks |
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" | 0.07 |
A groove is melted into the base metal beside the weld in the condition called ___________ | undercut |
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). | II |
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 | F3 electrodes only |
the gauge shown in the figure above is a(N) ____________ gauge | fillet weld |
the number / letter designator for fillet welding on plate in the flat position is_______ | 1F |
porosity can be grouped into ______ major types | four |
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 | general foreman |
prior to welding, the base metal should be examined for conditions that may cause weld defects, and the dimensions should be __________ | confirmed by measurement |
the walls surrounding the area in which GTAW work is being performed should be painted with paint that is ______ | non reflective |
Carbon steel filler metals are identified by AWS specification A5.18 and low - alloy steel filler metals are identified by AWS specification ___________ | A5.28 |
when filler metal is graded for rigid control fabrication, the purchaser receives________ | certificate of conformance |
if you see the label TIG on a welding machine, that machine is considered to be what kind of a welding machine | GTAW |
GTAW is almost always performed using | DCEN . direct current 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 used for AC welding are | pure |
which welding process is recommended for the repair of a defect on clean magnesium castings | GTAW |
one of the advanced features associated with the GTAW process is the high frequency intensity controls that provide better | arc starting |
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 more than how many times the diameter of the electrode | 3 |
when making GTAW stringer beads in the vertical position you should use a push angle of | 15-20 degrees |
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 wear a respirator that supplies air from | outside the work space |
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 weld to prevent | cracking |
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 second bead should you overlap | 1/2 |
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 the | torch angles |
the travel angle created when the torch is tilted backward so that the tip precedes the torch in the direction of the weld is called a | push angle |
in the freehand technique the GTAW filler rod should be held at what angle to the plate surface | 20 degrees |
when making a GTAW fillet weld in the 1f position the torch must be held at what angle to each plate surface | 45 degrees |