API 577 Questions With Correct Solutions

API 577 None! Number of welds to RT is established by the primary code - ANS How many welds does 577 require to be RT'd Arc blow - ANS Deflection of an arc from normal path because of opposing magnetic forces Arc length - ANS Distance from the tip of the welding electrode to the adjacent surface of the weld pool Autogenous - ANS Welds made without filler metal Backing - ANS Material or device placed on back side of a joint, to support and retain weld metal Defect - ANS A discontinuity that does not meet acceptance criteria, term designates rejecability Discontinuity - ANS The interruption of the typical structure of a material, discontinuity not necessarily a defect Inclusion - ANS Entrapped foreign solid material, such as slag, flux, tungsten, or oxide Undercut - ANS A groove welded into the base metal adjacent to the weld toe or weld root and left unfilled by weld metal Based on nature of the non-conformance - ANS Corrective action of non-conformance SMAW - ANS Which welding process is most widely used SMAW process - ANS Arc between a covered electrode and weld pool. Heat of arc comes from tip of a consumable covered electrode. Shielding comes from decomposition of the electrode coating. SMAW (basic functions of electrode coating) - ANS Shielding gas, prevent excessive grain growth, slag blanket to protect weld, sometime provides alloy elements GMAW-short circuit - ANS Which welding process is "fast freezing and prone to have LOF" GMAW-spray transfer - ANS Which welding process uses a direct stream of discrete drops Essential & Non essential, Supp Essential when toughness testing required - ANS Variables required on WPS Essential, non essential are optional - ANS Variables required on PQR Manufacturer or contractor (owner of procedure) - ANS Who supervises the testing of PQR coupon (per section IX) Base metal, filler metal, fluxes & gases - ANS What are welding materials To reduce # of PQR's - ANS What is the purpose of P-numbers Usability characteristics - ANS What is the basis for F-numbers Qualified with all electrodes with the same F-number, with CS also qualifies with other F-numbers - ANS A welder who qualifies for a specific F-number is also qualified for what Titanium - ANS What alloy is P-53 Analysis of chemical composition of the weld - ANS What is the A-number Warm holding ovens - ANS Some electrodes are stored in Separate from other electrodes - ANS Low hydrogen electrode storage Discard - ANS What to do with wet fluxes or electrodes Welder requalification - ANS A change in WPQ essential variable requires Overlap, undercut also would be correct but not 1 of the 4 choices - ANS Which discontinuity is at the toe of the weld UT - ANS How best to find side wall LOF VT - ANS Most extensively used NDE method for welds 6"-24" - ANS VT visual exam distance 30 degrees - ANS VT visual exam minimum angle 100 foot-candles - ANS VT needed light intensity Perpendicular to discontinuity - ANS MT-flux direction to best see discontinuity Deflect arc "Arc Blow" - ANS Result of MT residual magnetism Chlorine & fluorine (code mention chlorine, sulfur and halogens) - ANS PT on SS watch for Thickness of base metal plus reinforcement - ANS What determines which IQI should be used Perpendicular across weld - ANS Placement of wire type IQO Iridium 192 & Cobalt 60 - ANS Typical RT sources .250-3" - ANS Iridium 192 used on what thicknesses 1.5"-7.0" - ANS Cobalt 60 used on what thicknesses Before and after use - ANS When to calibrate for UT W/in 25 degrees of part examined - ANS UT calibration block temp should be At least 30 minutes - ANS Pressure test typical holding time per 577 Castings - ANS Weld metal is similar to that of Portion of base metal that has not been melted but who's mechanical properties have been altered - ANS What is the HAZ 1350 F - ANS The HAZ for CS is parent metal not melted but exceeding what temp Toughness - ANS Ability of material to absorb energy and deform plastically before fracturing Charpy impact test - ANS One of most common tests for toughness Material is brittle - ANS What do low toughness values indicate Relieve residual stress - ANS Primary reason for PWHT Jominy Bar - ANS Test for hardenablilty Martensite formed during heating and cooling - ANS Hardenablilty is related to the amount of Hydrogen cracking or loss of ductility and toughness - ANS Significant amounts of martensite in the HAZ 5-20% - ANS Austenitic welds require how much delta ferrite to resist cracking Tendency to be sluggish - ANS Differences in welding nickel alloys Low hydrogen electrodes - ANS Rod type to use when hot tapping E7016, E7018 & E7048 - ANS Examples of low hydrogen electrodes 1.3-4.0 ft/sec - ANS Product flow rate in piping during hot tapping 3/32" diameter - ANS Max rod size when hot tapping material less than 1/4" thick Tensile strength - ANS What do the first two digits mean in SMAW electrode Solid wire - ANS What does "S" mean in electrode designation of GMAW/GTAW