CWB Module 10 Questions and Answers Rated A+

CWB Module 10 Questions and Answers Rated A+ Where do transverse cracks occur? (a) weld metal and base metal (b) weld metal only (c) base metal only (d) weld craters (a) weld metal and base metal Porosity may occur: (a) open to the surface of the weld only (b) in the heat-affected zone only (c) below the surface of the weld only (d) open to the surface and/or below the surface of weld (d) open to the surface and/or below the surface of weld Discontinuities are... (a) unwanted defects (b) interruptions in the desirable physical structure of the weld (c) welds that are undesirable (d) welds that may cause harm to the structure (b) interruptions in the desirable physical structure of the weld A defect is: (a) an undesirable interruption of a weld (b) a dimensional error that needs to be corrected (c) a discontinuity that represents a danger to fitness for service of weld or structure (d) an interruption in the desirable physical structure of the weld (c) a discontinuity that represents a danger to fitness for service of weld or structure Fitness for service is a concept of weld evaluation that seeks a balance between (a) reliability and economy of welding procedure (b) quality of welding procedure (c) quality and reliability of welding procedure (d) quality, reliability and economy of welding procedure (d) quality, reliability and economy of welding procedure Weld discontinuities are divided into these general classes (a) process or procedure related, metallurgical, and design related (b) process related, material, and conception (c) metallurgical and design related (d) procedure related, design related (a) process or procedure related, metallurgical, and design related Dimensional errors are the direct result of (a) poor shop instructions (b) untrained employee (c) poor workmanship in operations (d) poor quality control (c) poor workmanship in operations Working with CSA Standard W59 or AWS D1.1 a groove angle specified on a drawing as 60 degree is required to be between (a) 60 - 65 degree (b) 55 - 70 degree (c) 55 - 60 degree (d) 60 - 70 degree (b) 55 - 70 degree Working with CSA Standard Z662 a groove angle specified on a drawing as 60 degrees is required to be between (a) 60 - 65 degree (b) 55 - 70 degree (c) 55 - 60 degree (d) 60 - 80 degree (d) 60 - 80 degree CSA Z662 requires that abutting ends be aligned, the maximum allowable offset as specified for components with the same nominal wall thickness at the bevel is (a) 2 mm (b) 1.6 mm (c) 1 inch (d) 1/2 inch (b) 1.6 mm Depending on the condition of the shear blades and lubricants used, various foreign materials may be entrapped leading to (a) porosity and incomplete joint penetration (b) insufficient effective throat thickness (c) porosity, slag entrapment and incomplete fusion (d) slag entrapment and incomplete fusion (c) porosity, slag entrapment and incomplete fusion When oxygen is used in oxyfuel cutting, there is the potential for notches and irregularities to occur. Slag may adhere to these notches and surfaces. If not removed prior to welding the following discontinuities may occur (a) slag entrapment and incomplete fusion (b) porosity and incomplete joint penetration (c) porosity, incomplete fusion, slag entrapment and chemical composition defects (d) porosity and chemical defects (c) porosity, incomplete fusion, slag entrapment and chemical composition defects When cutting high-strength quenched and tempered steel, a localized martensitic microstructure forms along the edge of the cut surface from the localized heating and fast cooling associated with the cutting process. It may be necessary to remove up to (a) 5 mm of material by mechanical means to remove the hard, heat-affected zone (b) 1 inch of material by mechanical means to remove the hard, heat-affected zone (c) 1/2 inch of material by mechanical means to remove the hard, heat-affected zone (d) 2 mm of material by mechanical means to remove the hard, heat-affected zone (d) 2 mm of material by mechanical means to remove the hard, heat-affected zone According to CSA W59 and Z662, in preparation of material, surfaces and edges to be welded shall be (a) clean (b) smooth, uniform and free from fins, tears, cracks, and other defects (c) clean and constant size (d) smooth and clean (b) smooth, uniform and free from fins, tears, cracks, and other defects Surfaces to be welded shall be free from loose or thick scale, slag, rust, paint, grease, moisture, and other foreign material within (a) 12 mm (1/2 in) (b) 25 mm (1 in) (c) 50 mm (2 in) (d) 38 mm (1.5 in) (c) 50 mm (2 in) Occasional notches, not more than 5mm (3/16 in) deep shall be removed (a) by cleaning and adding weld (b) by machining or grinding (c) gouging and welding (d) adding weld deposit (b) by machining or grinding Occasional notches, exceeding 5mm (3/16 in) deep and less than 10 mm (3/8 in) deep shall be removed (a) by welding with the Engineer's approval (b) by machining or grinding (c) gouging and welding (d) adding weld deposit (a) by welding with the Engineer's approval In preparation, for material 100 mm (4 in) thick or over the depth of the notch shall not exceed (a) 5 mm ( 3/16 in) (b) 10 mm (3/8 in) (c) 15 mm (9/16 in) (d) 12 mm (1/2 in) (c) 15 mm (9/16 in) Overlap is a condition where (a) an excess of weld metal exists (b) an excess of weld metal deposit in convexity (c) an excess of weld metal exists at the toe of a weld beyond the limits of fusion (d) a reduce amount of weld metal exists (c) an excess of weld metal exists at the toe of a weld beyond the limits of fusion Overlap has the ability to mask (a) weld reinforcement (b) complete joint penetration (c) incomplete fusion (d) incomplete joint penetration (c) incomplete fusion If the nature of overlap is examined, it will be found that there is a (a) complete joint penetration (b) mass of weld reinforcement (c) mass of weld metal that is fused to the parent metal (d) mass of weld metal that is not fused to the parent metal (d) mass of weld metal that is not fused to the parent metal Convexity is defined as (a) the minimum distance from face of a convex fillet weld perpendicular to a line joining the weld root (b) the maximum distance from face of a convex fillet weld perpendicular to a line joining the weld root (c) the maximum distance from face of a convex fillet weld perpendicular to a line joining the weld toes (d) the minimum distance from face of a convex fillet weld perpendicular to a line joining the weld toes (c) the maximum distance from face of a convex fillet weld perpendicular to a line joining the weld toes The term Convexity normally refers to the profile of a (a) groove weld (b) fillet weld (c) reinforcement weld (d) complete penetration weld (b) fillet weld Weld Reinforcement refers to the profile of a (a) groove weld (b) fillet weld (c) reinforcement weld (d) complete penetration weld (a) groove weld Weld reinforcement is defined as (a) an area of the groove weld that has insufficient weld metal (b) an area of the fillet weld that has excess weld metal (c) an area of the weld that has weld metal added in excess of that permitted by the code or standard (d) an area of the weld that has weld metal added in excess (c) an area of the weld that has weld metal added in excess of that permitted by the code or standard CSA Z662 refers to weld reinforcement as "weld crown" and the acceptance criterion is in relation to nominal wall thickness. For pipe with 10mm or less thickness, the maximum crown is (a) 1/2 inch (b) 3 mm (c) 1 mm (d) 2.5 mm (d) 2.5 mm CSA Z662 refers to weld reinforcement as "weld crown" and the acceptance criterion is in relation to nominal wall thickness. For pipe with a thickness greater than 10 mm, the maximum crown is (a) 1/2 inch (b) 3.5 mm (c) 1 mm (d) 2.5 mm (b) 3.5 mm The maximum weld reinforcement permitted by CSA W59 and AWS D1.1 is (a) 3 mm (1/8 inch) (b) 3.5 mm (c) 1 mm (d) 2.5 mm (a) 3 mm (1/8 inch) To repair excessive weld reinforcement (a) grind the weld flat (b) grind the weld (c) grind the weld and blend the toes to the base metal to reduce notch effect (d) gouge the weld flat (c) grind the weld and blend the toes to the base metal to reduce notch effect Weld underfill is defined as (a) an area of the groove weld that has insufficient weld metal (b) weld metal less than required to adequately fill a joint (c) an area of the weld that has weld metal added in excess of that permitted by the code or standard (d) an area of the weld that has weld metal added in excess (b) weld metal less than required to adequately fill a joint Undercut is defined as (a) an area of the groove weld that has insufficient weld metal (b) weld metal less than required to adequately fill a joint (c) the melting away of the parent metal during the welding process (d) an area of the weld that has weld metal added in excess (c) the melting away of the parent metal during the welding process