This document is a must for every welding school, fabricator and home hobbyist. Published on may 23, 2017 may 23, 2017 43 likes 5 comments. Welding, brazing, soldering does not include mechanical fastening such as bolts, rivets, screws, etc. Rate of heat type 304 conducts heat much more slowly than carbon steel thus. Purpose to avoid misuse of welding electrode to provide welders with goodcondition electrode in order to get sound weld 4. It is also affected by the starting position of the welding. Tungsten also called wolfram is a metal with a fusion point of more than 3300oc, which means more than double the fusion point of the metals which are usually welded. Pure tungsten electrode of ball tip shape with dcen provides good arc stability.
At our welding qualification center, partek welding engineers develop trusted welding procedures for clients. This is the welding industrys comprehensive reference on safety. The following describes the proper procedure for lighting and shutting off a gas welding torch. The aws reference codes of the american welding society are commonly used in north america. Oxyacetylene gas welding is commonly used to permanently join mild steel. Tig can be used to weld copper, titanium, even two dissimilar metals, and is handy for making tricky welds e. Welding procedures for specific work require approval to be compliant with dnv gl rules for maritime welding or international standards such as iso 3834 or din 2303. Even if your customer does not require a formal procedure, you should consider preparing one. Heavy sections of steel, and higher strength steels with their corresponding higher carbon andor alloy levels, typically require preheat. This evolution in technology also prompted changes in procedures for weld meter testing and. Then, test your operators to ensure that they can produce satisfactory welds using the procedure. Welding procedure specifications wps presented by john lucas welding engineer uti corporation.
Pay close attention to the base metal that is called out. International standards as well as shipbuilding rules, for e. This standard welding procedure specification is an outgrowth of the coordinated work of the welding procedures committee of the welding research council and the aws b2 committee on welding procedure and performance qualification. Key wordswelding procedure specification, base metal, allowable joint designs, filler metal, carbon steel, manual shielded metal arc welding. The purpose of a welding procedure qualification is to provide test data for assessing the properties of a weld joint. Other names for gas welding are oxyacetylene welding and oxy welding. When the electrode is positioned close to the work piece, an arc is created across the gap between the metal and the hot cable electrode. The arc and molten metal are shielded by a blanket of granular flux.
The arc welding is a fusion welding process in which the heat required to fuse the metal is obtained from an electric arc between the base metal and an electrode. This procedure reduces the possibility of regulator fires when the oxygen cylinder valve is opened again. Welding procedures and welder qualifications p artek is the gulf coasts trusted source for welding procedure development and certification of welder performance, all designed to promote safety and quality workmanship on your job site. Developed in 1903, gas welding is used to weld pipes and tubes together while also being an effective way to repair metal. The product technical manual may provide additional information on calibration procedures. Welding procedure specification wps may be generated by an authorized person i. American petroleum institute api b each welding procedure must be recorded in detail, including the results of the qualifying tests. Gas welding is a process of construction that involves the use of gases as well as oxygen to weld metals together. The purpose of this procedure is to provide instructions for post weld heat treatment pwht of welded joints. The scope of this procedure applies to personnel conducting visual welding inspections vt and nde under the lanl welding program, including subcontractor personnel when invoked by specification or contract. A mixture of oxygen and acetylene, burns as an intense focussed flame, at approximately 3,500 degrees centigrade. When the flame comes in contact with steel, it melts the surface forming a molten pool, allowing welding to.
The transition from analog meters to digital displays brought a new level of accuracy to weld parameter control and indication on miller welding equipment. This record must be retained and followed whenever the procedure is used. This change during the first part of welding depends on the order in which the tack welds are made. Calibrationvalidation guidance for miller welding equipment. The art and science of joining metals by using the intrinsic adhesive and cohesive forces of attraction that exist within metals. Tig welding method and application tig welding definition the designation tig comes from usa and is an abbreviation of tungsten inert gas. Sample welding procedure specifications are available on our website. Prevention of distortion arrangement for any production test.
Welding the root pass before beginning to weld the pipe, the procedure should be checked to assure that the correct electrode is being used. Some type of log or form listing the welders names, welding process, date witnessed and the new expiration date would be enough. Suitability of welding procedure specification identity of parent material identity of welding consumables joint preparation e. Process specification for the manual arch welding of. This includes the diameter and the classification of the electrode. Moreover, thorium, zirconium and lanthanum modified. An ionized column of gas develops to complete the circuit. Tig welding is one type of welding amongst a few choices you have mig, stick, oxyacetylene, etc.
Guidelines for developing a procedure for the weld repair. A welding procedure specification wps sets broad guidelines for the shop and field. The welding of stainless steels international stainless steel. Now readers have an early opportunity to order this new and totally revised edition. With over 500,000 copies of previous editions published since 1933, the procedure handbook is considered by many to be the bible of the arc welding industry. This bulletin is written with the arc welding operator in mind, containing both mandatory safety practices and those based on shop experience. Welding procedure qualification pqr a test that is performed to demonstrate that the contractor can make satisfactory welds as specified in the welding procedure specification mechanical testing is required and nde may be required, depending on the code being. The class introduces the different welding processes as well as their general attributes and applications. Introduction to welding provides the foundational understanding of welding and welding processes on top of which processspecific knowledge and a more comprehensive understanding of welding in general is built. Welding procedures comprise a set of detailed instructions on how the weld is to be performed, with the purpose to facilitate planning and quality control of the welding operation. This is a list of welding processes, separated into their respective categories. The procedure handbook of arc welding arc welded projects welding safety dvd welding kits instructor pack with over 500,000 copies of previous editions published since 1933, the procedure handbook is considered by many to be the standard of the arc welding industry. Arc rays from the welding process produce intense visible and invisible ultraviolet and infrared rays that can burn eyes and skin.
Slagboy enterprises authorized by samuel slaghammer oct 28, 2011 welding. The basic arc welding circuit is an alternating current ac or direct current dc power source connected by a work cable to the work piece and by a hot cable to an electrode. Welding and joining guidelines haynes international. To ensure highquality results, all welding work needs to be carried out as specified in welding procedure specifications wps. Standard welding procedure american welding society. Welding is a fabrication or sculptural process that joins materials, usually metals or. The hardbound book contains over 750 pages of welding information techniques and procedures. They are required to demonstrate the ability to produce welds possessing the correct mechanical and metallurgical properties and. The quality of a stud weld depends not only on strict compliance with the welding procedure specification but also on the correct function of the actuating mechanism e. The weld joint was a full penetration butt weld performed on a ugroove on 85 mm. The welding consumable should be selected to correctly match or overmatch the strength of the pipe. Project standards and specifications welding control. Design of welding fixture for sample parts and user.
Guidelines for developing a procedure for the weld repair of process pipelines in oil refineries. Numbers in parentheses are obsolete and were removed from the current 1998 version of iso 4063. Developing a welding procedure specification wps dnv gl. P91 to p91 this procedure employed dual process welding involving a root layer and three hot runs deposited using the manual tungsteninert gas tig welding process, followed by filling and capping using the submerged arc welding process. Addressed in the individual units of instruction are the following topics. The principle of tungsten inert gas tig welding process. Welding procedure specificaton wps btc gmaw 9010 2011 prequalified per aws d1. The associated n reference numbers second column are specified in iso 4063 in the european union published as en iso 4063. An arc welding process that uses an arc between a bare metal electrode and the weld pool. Simulation of tack welding procedures in butt joint. Tig welding normally uses constant current type of power source with welding current ranging from 3200a or 5300a or higher and welding voltage ranging from 1035v at 60% duty cycle.
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