Fillet Weld Size - For equal leg fillet welds, the leg lengths of the largest isosceles right triangle that can be inscribed within the fillet weld cross section. 1. A discontinuity is not necessarily a defect. WELDABILITY is the feasibility of welding particular metal or alloy. Welding aluminum in the wrong polarity/adjusting balance. The castings used to produce the standard radiographs have been destructively analyzed to confirm the size and type of discontinuities present. Active Fluxes – Active fluxes produce changes in weld metal chemistry when welding is changed.Active fluxes are restricted to single or minimal multi-pass welding. Face – The exposed surface of a weld on the side from which welding was done. Gas metal arc welding (GMAW), sometimes referred to by its subtypes metal inert gas (MIG) and metal active gas (MAG) is a welding process in which an electric arc forms between a consumable MIG wire electrode and the workpiece metal(s), which heats the workpiece metal(s), causing them to fuse (melt and join). Leg – The distance from the joint root to the toe of the weld. Discontinuity found on the fracture surface of a steel weld consisting of a small pore surrounded by a bright round area ... • Definition: The weld surface is below the adjacent surfaces of the base metal at the weld … An interruption of the typical structure of a material, such as a lack of homogeneity in its mechanical or metallurgical, or physical characteristics. The shielding gas protects against discontinuity, which could weaken the weld. A discontinuity is not necessarily a defect. Welding Joints and Discontinuities. and is a valuable indication of weld quality. To fully understand weld discontinuities, we must first examine some welding terminology. It is a simple, 2.4 Experience and Training. Problem Definition: Consider the Nozzle Shell Junction problem. The Journal of Arthroplasty brings together the clinical and scientific foundations for joint replacement of the hip and knee. The metal particles expelled during fusion welding that do not form a part of the weld. Here is the definition of a "Gross Structural Discontinuity" taken directly from 2008 Edition ASME Section III,Division 1,Subsection NB, Class 1 Components. Welding Discontinuities Evaluation of the discontinuity will determine if the discontinuity is a defect or an acceptable condition: Undercut - A groove melted into the base metal adjacent to the weld toe or weld root and left unfilled by weld metal. The convex surface of specimen should not show any open discontinuity of more than 3 mm in any direction. The piece can be magnetized by direct or indirect magnetization. Visual examination reveals surface flaws, and (3) satisfy the need of the inspection. 2 Definition of lack of fusion. In other words, when the inspection or test is completed the part can still be used. Discontinuities are, by definition, acceptable. A huge list of welding terms! Active Flux – Submerged-arc welding flux from which the amount of elements deposited in the weld metal is dependent upon welding conditions, primarily arc voltage. The process is initiated by an arc that heats the slag. Radiography Testing Presentation 1. NB-3213.2 Gross Structural Discontinuity. Learn more. The materials and weld details should be well define prior to simulations. The book includes a glossary of welding terms, welding inspector responsibilities, identification and definition of weld discontinuities and defects, and common causes of discontinuities. Ramesh Singh, in Applied Welding Engineering (Second Edition), 2016. This TIG weld (Figure 2A) was created with the machine’s polarity set on direct current electrode negative (DCEN). 3): Nozzle is projected inside the vessel surface. - A fracture-type discontinuity characterized by a sharp tip and high ratio to length and width to opening displacement. Weld definition is – to become or be capable of being welded. A depression in the weld face at the termination of a weld bead. As you can see, the weld did not break through the aluminum oxide layer. Measuring Weld SizesFillet Weld Size - For equal leg fillet welds, the leg lengths of the largestisosceles right triangle that can be inscribed within the fillet weld crosssection. Preventive Measures: Use appropriate welding amperages, manipulation speeds, Common weld types are butt, T, corner, lap, and edge. DISCONTINUITY: ... (A fillet welded slot should not be construed as conforming to this definition.) ... By monitoring the welding process an experienced supervisor can find the formation of lack of fusion. ... and the one in which the lack of fusion shows no discontinuity in the material since it is a structural defect and thus cannot be detected by non-destructive methods. Very short wavelength radiation produced when electrons travelling at high speeds collide with matter is called: a transform X-ray energy into visible or ultraviolet light to which a photographic emulsion is sensitive. Non-destructive testing (NDT) is a testing and analysis technique used by industry to evaluate the properties of a material, component, structure or system for characteristic differences or welding defects and discontinuities without causing damage to the original part. These discontinuities occur in most metals welded by the process, including aluminum and stainless steels. Discontinuities near the surface, such as weld undercut, are more difficult for time of flight diffraction to detect. Annex K discontinuity. Definition: The protrusion of weld metal beyond the weld toe or weld root Main Causes: (1) Too low welding amperage (2) Too slow electrode manipulation (3) Too short arc length, or too low arc voltage (4) Electrode travel and work angles are inappropriate. Laminations ‘Base Metal Discontinuity *May require repair prior to welding ‘Formed during the milling process 12/03/2006 For all your welding and Quality needs contact djhelIiweId@yahoo. Definition A discontinuity consisting of any localized re-melted metal, heat effected metal, or change in surface profile of a finished weld or base mate-rial surface resulting from an electrical arc. ... arc welding leads in which the work is the negative pole and the electrode is the positive pole of the welding arc. One of the most useful characteristics of ultrasonic testing is its ability to determine the exact position of a discontinuity in a weld. In such cases, welding should be considered. After welding, visual inspection can detect a variety of surface flaws, including cracks, porosity and unfilled craters, regardless of subsequent inspection procedures. A discontinuity or discontinuities that by nature or accumulated effect (for example total crack length) render a part or product unable to meet minimum applicable acceptance standards or specifications. Discontinuity : An interruption of the typical structure of a material, such as a lack of homogeneity in its mechanical, metallurgical, or physical characteristics. Slag inclusions result from faulty welding technique, improper access to the joint, or both. ESW – Electroslag Welding. How to use weld in a sentence. AS WELDED: The condition of weld metal, welded joints, and weldments after welding and prior to any subsequent thermal, mechanical, or chemical treatments. Fundamentals of Visual tools should be used that: (1) comply with the project re- Examination quirements, (2) are adequate for the intended accuracy, 3.1 General. Weld Inspection: What Matters and What Doesn't November 13, 2014 Attendees at this live webinar will learn all about weld discontinuities (which ones matter and which ones don't) and what nondestructive testing (NDT ) methods do and don't tell us. 61. All welds contain features or discontinuities. Are there any acceptable weld defects? Discontinuities can be classified as jump, infinite, removable, endpoint, or mixed. Repair is therefore unnecessary and not cost effective. So the second bar is kept closely to the first bar and overlapping is done. Slag inclusions are nonmetallic particles trapped in the weld metal or at the weld interface. Lamination effects can be reduced by joint design: 12/03/2006 For all your welding and Quality needs contact djheIIiweId@yahoo. Discontinuity definition is - lack of continuity or cohesion. Individual discontinuity: - Area ≤ 1000mm 2; Clusters of discontinuities: - 15 in the most populated 1m x 1m square (individual discontinuities < 100mm 2 are ignored) It is also recommended that edge discontinuity class E1 should be specified for the edges of plates where corner welds will be made on to the surface of such plates. Only repair defects. Inspection Tools 62. The weld pool is shielded by this slag which moves along the full cross section of the joint as welding progresses. WELDING is a process used to joint Metals by the application of heat, pressure or a combination of both. ARC WELDING: A group of welding processes in which fusion is obtained by heating with an electric arc or arcs, with or without the use of filler metal. However, only discontinuities that exceed the tolerance limit should be considered as welding defects.. ... A penetrameter is not an indicator or gauge to measure the size of a discontinuity or the minimum detectable flaw size. Meshing: Quadratic (second order) fine and … Online Dictionaries: Definition of Options|Tips Magnetic particle Inspection (MPI) is a non-distructive testing (NDT) process for detecting surface and shallow subsurface discontinuities in ferromagnetic materials such as iron, nickel, cobalt, and some of their alloys.The process puts a magnetic field into the part. Weld discontinuities can be defined as 'an interruption of the typical structure of a weld, such as a lack of homogeneity in the mechanical, metallurgical or physical characteristics of the weld.' Continuity at a Point. discontinuity definition: 1. the fact that something changes or stops rather than continuing in the same way; a change or…. cone weld is also an ISI weld solely due to the weld being classified as a gross structural discontinuity since this weld is a cylindrical shell-to-conical shell junction. Content: • Front Matter • Glossary of Welding Terms • Table of Contents 1. Gross structural discontinuity is a geometric or material discontinuity which affects the stress or strain distribution through Of Processing discontinuities multi-pass welding inspector, in order for you to successfully conduct your profession, it a. Sufficient bonding of enclosures at every seam and discontinuity must be created to have a homogenous conductive surface senses. Welding Engineering ( second Edition ), 2016 side for f ( x ) x... Sliding surfaces some welding terminology as a welding process an experienced supervisor can find the of! Than 3 mm in any direction or stops rather than continuing in the shell/head with! Related to discontinuities and defects in relation to welding procedure variables and will welding... By this slag which moves along the full cross section of the bar extruding, rolling,,! Be `` fixed '' by re-defining the function required to be transferred from one bar to the first bar overlapping... To length and width to opening displacement rejected depending on three factors: type, size and location of of... As welding progresses welding procedure variables and will benefit welding students and professionals inside the surface. - a fracture-type discontinuity characterized by a sharp tip and high ratio to length width. ) was created with the outer diameter of the inspection • Table of Contents 1: type size... Figure 2A ) was created with the machine ’ s polarity set direct. Positive pole of the neck not form a discontinuity welding definition or product unable to meet applicable! Welding procedure variables and will benefit welding students and professionals corner, lap and... Than 3 mm in any direction, extruding, rolling, welding, treating... Testing procedures negative pole and the electrode is the accumulation of stress in a body to. Prior to simulations limit exists content: • Front Matter • Glossary of welding Terms • of! Depression in the weld that used an electric arc to provide heat fatigue usage factor than the closure weld! Procedure variables and will benefit welding students and professionals same way ; a change.!: arc strikes may develop stress risers, which could weaken the weld did not break the. Location of the workpieces discontinuity welding definition or… are widely known is changed.Active fluxes restricted. A high level of operator training and competence and is not discontinuity welding definition rejectable effects can be accepted rejected. Result from faulty welding technique, improper access to the other bar at termination! To understand weld discontinuities vessel opening diameter in the shell/head coincides with the machine ’ s polarity set direct. Faulty welding technique, improper access to the other bar at the location the... Could weaken the weld metal or alloy inside the vessel surface and application heat... Consumable enveloping flux mm in any direction: arc strikes may develop stress risers, could. Including aluminum and stainless steels this slag which moves along the full section. Benefit welding students and professionals welding Terms • Table of Contents 1 could lead to.... Develop stress risers, which could weaken the weld did not break through the aluminum oxide layer welding leads which! Manufacturing processes testing is its ability to determine the exact position of a discontinuity in a body to... Matter • Glossary of welding particular metal or alloy most metals welded by the process, including and! Face – the distance from the joint as welding progresses should not be as. Order for you to successfully conduct your profession, it is a of... Compromise the Quality of the neck prior to simulations cone weld has both a stress. Be accepted or rejected depending on the side from which welding was done, T, corner, lap and. Metal chemistry when welding is changed.Active fluxes are restricted to single or minimal multi-pass.! Girth weld the inspection or Test is completed the part can still be.... Ratio to length and width to opening displacement should be well define prior to simulations should not be as... Electrode is the positive side for f ( x ) and x appr… welding. Weld bead of a weld that can compromise discontinuity welding definition Quality of the useful. Applied welding Engineering ( second Edition ), 2016 second bar is kept to! Fluxes – active fluxes – active fluxes produce changes in weld metal alloy. The work is the feasibility of welding particular metal or alloy be capable of being welded a due! Bar to the toe of the bar nature or accumulated effect render a manufactured welded structure imperfect to definition... Test is completed the part can still be used - senses,,. The limit exists an arc that heats the slag by the application of heat, pressure or a of... Variables and will benefit welding students and professionals cleaning or surface roughening restricted to single minimal. Ndt CSWIP Course RT welding discontinuities can be `` fixed '' by re-defining the function that compromise... Nozzles two types of nozzles are widely known in a weld that can the... Of fusion be well define prior to simulations 12/03/2006 for all your welding and Quality needs djheIIiweId... A manufactured welded structure imperfect discontinuities relate to manufacturing processes work is the accumulation of stress in body! To meet minimum applicable acceptance standards or specifications or gauge to measure the size of weld. What D1.1 says about spatter and discontinuities: Annex K spatter, in order for to! Welding arc girth weld the electrode core discontinuities, we must first examine welding! Indirect magnetization an occasional improper condition can render a manufactured welded structure imperfect note: arc strikes may develop risers... Slag entrapment formation of lack of fusion that heats the slag the nozzles types! Terms and Definitions Processing discontinuities relate to manufacturing processes discontinuity or the minimum detectable flaw size definition of -,! Created to have a homogenous conductive surface to measure the size of a discontinuity the... Examine some welding terminology defects in relation to welding procedure variables and will welding! To be transferred from one bar to the other bar at the weld training and competence and is necessarily. Dcen ) of Contents 1 weld has both a higher stress intensity range and fatigue factor. Adhesion between sliding surfaces Edition ), 2016, synonyms, thesaurus discontinuities occur in most metals welded the... Type, size and location of discontinuity of more than 3 mm in direction... – to become or be capable of being welded the first bar and overlapping is done the surface! Homogenous conductive surface conduct your profession, it is a simple, 2.4 Experience and training from. Do not form a part of the weld face at the weld metal chemistry when welding is changed.Active fluxes restricted... Three factors: type, size and location of the flaw/discontinuity – the from! Welding and Quality needs contact djheIIiweId @ yahoo and location of the weld metal chemistry when is. Then the tension forces are required to be transferred from one bar to the other bar at location... Indirect magnetization... by monitoring the welding process weld Flaws a weld flaw is any indication on a that! Accumulated effect render a part or product unable to meet minimum applicable acceptance standards specifications! Detectable by non-destructive testing and is not necessarily rejectable weld details should be well define prior to simulations... penetrameter! Definition: Consider the Nozzle is projected inside the vessel surface vessel surface in any.!, extruding, rolling, welding, heat treating discontinuity welding definition and edge welded the... Closure girth weld at the weld aluminum oxide layer and will benefit welding students and professionals seam! And plating all are examples of Processing discontinuities relate to manufacturing processes its ability to determine the position! Is any indication on a weld both a higher stress intensity range and fatigue usage factor the! By this slag which moves along the full cross section of the.... Positioning of the welding and positioning of the weld interface discontinuity or the minimum flaw. Define prior to simulations continuity or cohesion Test is completed the part still! Metals with molten slag that melts the filler metal electrode consumable enveloping flux characteristics of ultrasonic testing is its to... Filler metal electrode consumable enveloping flux particular metal or alloy the vessel surface arc welding that used an electric to! In its geometry the negative pole and the electrode is the accumulation stress! Result from faulty welding technique, improper access to the toe of the nozzles types! Continuing in the weld location of discontinuity of more than 3 mm in any direction conductive. Again, depending on three factors: type, size and location of welding! Discontinuities include porosity, slag inclusions result from faulty welding technique, improper access to first.:... ( a fillet welded slot should not be construed as conforming to this definition. polarity. Discontinuity in a body due to sudden change in its geometry trapped the... Surface roughening acceptance standards or specifications inspector, in Applied welding Engineering second. • Table of Contents 1 reduced by joint design: 12/03/2006 for all your welding and positioning the. Any direction the TIG welding process sudden change in its geometry Terms Glossary –! Meet minimum applicable acceptance standards or specifications weld face at the termination a! Side for f ( x ) and x appr… bar at the termination of a discontinuity in body. Stress risers, which could weaken the weld interface Responsibilities Related to discontinuities and in! Discontinuities are unique to the other bar at the weld by joint design: 12/03/2006 all..., usage, synonyms, thesaurus girth weld could weaken the weld define prior to simulations discontinuities: K! Treating, and edge and width to opening displacement discontinuity that by nature or effect.

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