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Topic: Weldability


In the News (Thu 28 Aug 14)

  
  Weldability - Wikipedia, the free encyclopedia
The weldability of steels is inversely proportional to a property known as the hardenability of the steel, which measures the ease of forming martensite during heat treatment.
The effect on weldability of elements like chromium and vanadium, while not as great as carbon, is more significant than that of copper and nickel, for example.
The weldability of aluminum alloys varies significantly, depending on the chemical composition of the alloy used.
en.wikipedia.org /wiki/Weldability   (529 words)

  
 [No title]
Weldability is a word used only in the welding industry, and a search for it in Webster's dictionary will be fruitless.
The word "weldability" usually means the ease with which a metal material melts and flows together to form a weld joint that exhibits almost as much mechanical, thermal, and corrosion resistance properties as the base metal.
Weldability also implies an ability to produce an acceptable weld speed under the welding arc, and this can vary greatly according to the material.
www.pro-fusiononline.com /feedback/tpj-mar00.htm   (1786 words)

  
 Arc Machines, Inc., Materials - Effects of Sulfur on Orbital GTA Welding of AISI 316L Stainless Steel
However, weldability is not the only criterion for selection of alloy composition and in the industries in which autogenous orbital welding is used, there are other considerations.
The implications of this study clearly demonstrate that it is impractical to attempt to predict the weldability of a particular heat of stainless steel based on sulfur levels alone.
For less critical applications where weldability is of foremost consideration, a sulfur range of 0.005 to 0.017 wt.% may be appropriate.
www.arcmachines.com /appPages/sulfur02.html   (7172 words)

  
 Process for preparing surface-treated steel strips adapted for electric resistance welding and strips produced by said ...
Making extensive investigations on the weldability and corrosion resistance after lacquering of welded can-forming steel plates, particularly thinly coated tinplates, the inventors have found that weldability remains satisfactory as long as the quantity of a hydrated chromium oxide film does not exceed a certain limit, but corrosion resistance is unsatisfactory within this limit.
The corrosion resistance after lacquering and weldability of surface-treated steel strips were examined by controlling the final electrolytic chromate treatment to change the respective amounts of metallic chromium and hydrated chromium oxide in the chromate film.
Particularly, the quantity of iron dissolved out from a cross-cut is in the range between 2 and 4 mg which is in contrast to comparative samples, proving the improved adhesion of a lacquer film to surface-treated steel and the improved corrosion resistance to which the second layer particularly contributes.
www.freepatentsonline.com /4561943.html   (6540 words)

  
 Selection and Weldability of Non-Heat-Treatable Aluminum Alloys
The absence of precipitate-forming elements in these low- to moderate-strength non-heat-treatable alloys becomes a positive attribute when considering weldability, because many of the alloy additions needed for precipitation hardening (for example, copper plus magnesium, or magnesium plus silicon) can lead to liquation or hot cracking during welding.
In addition, joint efficiencies are higher in not-heat treatable alloys because the heat-affected zone (HAZ) is not compromised by the coarsening or dissolution of precipitates.
Weldability of non-heat-treatable aluminum alloys can be measured in terms of resistance to hot cracking and porosity.
www.key-to-metals.com /Article22.htm   (1158 words)

  
 High Performance Steel - Research to Practice
Strength, weldability, toughness, ductility, corrosion resistance, and formability are all important to determine how well a steel performs.
Weldability is a property that is somewhat difficult to define.
Weldability is being studied through a series of tests.
www.tfhrc.gov /pubrds/spring97/steel.htm   (2002 words)

  
 Sec. 8 Introduction
The weldability test consists of the production of carefully controlled autogenous welds (an autogenous weld is one made without filler metal) on test castings preheated to various temperatures and the determination of a minimum temperature, called the "no-crack temperature" above which there is no cracking in the test weld.
Although the cast iron weldability test indicates that the "no-crack temperature" is related to composition but not microstructure (Figure 8.
Although silicon increases hardenability slightly, this effect on weldability is offset by the strong graphitizing effect of silicon, which improves weldability by reducing carbide formation.
www.ductile.org /didata/Section8/8intro.htm   (2827 words)

  
 [No title]   (Site not responding. Last check: 2007-11-01)
Bronze is the most weldable of the copper alloys.
An alloy containing copper and lead, which has the poorest weldability because the toxic lead often contaminates the weld.
An alloy containing copper and tin, which is the most weldable of the copper alloys.
www.toolingu.com /class_class_desc.aspx?class_ID=650205   (1159 words)

  
 What is weldability? (Knowledge Summary)
To many people 'weldability' is simply a measure of how easy it is to make a weld in a particular material without cracks.
For a weld to be truly successful, however, it is also necessary for it to have adequate mechanical properties, and to be able to withstand degradation in service (eg corrosion damage).
Weldability is not a fixed parameter for a given material, but will depend on joint details, service requirements, and welding processes and facilities available.
www.twi.co.uk /j32k/getFile/ksrjp002.html   (504 words)

  
 Solidification and Weldability of Nb-Bearing Superalloys
The solidification and weldability of experimental superalloys containing systematic variations in Fe, Nb, Si, and C were studied using differential thermal analysis (DTA), microstructural characterization techniques, and Varestraint testing.
The sensitivity of microstructure type and resultant weldability to C content is reflected in the differences displayed by Alloys 11.5 and 12.
The solidification and weldability ofexperimental Nb-bearing superalloys with systematic variations in Fe, Nb, Si, and C was investigated by differential thermal analysis, Varestraint testing, and
www.aws.org /wj/supplement/dupont/dupont.html   (8257 words)

  
 Job knowledge for welders 23: Weldability of materials - Copper and copper alloys. (Jan.1997) (via CobWeb/3.1 ...   (Site not responding. Last check: 2007-11-01)
Phosphorus deoxidised copper is more weldable but residual oxygen can result in porosity in autogenous welds especially in the presence of hydrogen.
These are generally considered to be weldable, apart from phosphor bronze and leaded gun metal, and a matching filler composition is normally employed.
There are essentially two types of aluminium bronzes; single phase alloys containing between 5 and 10% aluminium, with a small amount of iron or nickel, and more complex, two phase alloys containing up to 12% aluminium and about 5% of iron with specific alloys also containing nickel and manganese and silicon.
www.twi.co.uk.cob-web.org:8888 /j32k/protected/band_3/jk23.html   (1233 words)

  
 High silicon chromium nickel steel for strong nitric acid - Patent 4279648
This invention relates to metallic materials having good workability and good weldability suitable for apparatuses for producing, treating and using nitric acid of a high concentration at a high temperature.
It is disclosed that they are excellent in resistance to stress corrosion cracking in a chloride atmosphere and resistance to general corrosion in sulfuric acid and hydrochloric acid atmospheres, but they are poor in the workability and weldability, and thus are less practical.
Ni: The necessary Ni content for balancing with Cr and Si to obtain an austenite structure containing a small proportion of martensite or ferrite structure and consequently obtain a good weldability and a good workability is 10 to less than 19% by weight.
www.freepatentsonline.com /4279648.html   (4136 words)

  
 Equivalent carbon content - Wikipedia, the free encyclopedia
The equivalent carbon content of a steel alloy refers to method of measuring the maximum hardness and the weldability of the alloy based on the chemical composition of the alloy.
Each of these materials tends to influence the hardness and weldability of the steel to different magnitudes, however, making a method of comparison necessary to judge the difference in hardness between two alloys made of different alloying elements.
The resulting equivalent carbon coefficient allows the alloy to be categorized alongside plain carbon steels, and have their weldability and hardness properties compared with them.
en.wikipedia.org /wiki/Equivalent_carbon_content   (215 words)

  
 Welding-steel low carbon and low alloy: Materials and Processes
Steels are generally classified according to their main application (construction steel [weldable], tool steel, bearing steel [not weldable]...) or to other qualification that make them suitable for special processing (free machining steel [not weldable], case hardening steel...) or to some other important characteristic that definitely separates a special class (stainless steels).
Welding-steel is concerned with the weldability of the various kinds of this material.
Welding-steel may be simple or complex: it depends on weldability, which studies how steel reacts to heat, in and near the weld.
www.welding-advisers.com /Welding-steel.html   (2019 words)

  
 JP Welding & Consulting-The Weldability of Investment Castings (via CobWeb/3.1 planetlab2.cs.unc.edu)   (Site not responding. Last check: 2007-11-01)
The weldability of a casting is not so apparent at the first and can only be recognized or confirmed through some trials or tests.
The weldability variables which can be affected by foundry techniques are cleanliness of casting, grain size, grain morphology, alloy segregation, and the extent of detrimental phases, etc.
Weldability and weld mechanical properties of 17-4 PH, In 617, In 625, In 718, Rene 220, PWA 1472, Weldable Waspaloy, GTD-222, In 939, RS-5, and Ti-6Al-4V, etc.
www.weldingsolution.com.cob-web.org:8888 /weldability.htm   (831 words)

  
 American Iron and Steel Institute :: Weldability Study of Resistance Spot Welds 'Steels' 2004 Sydney H. Melbourne Award ...
Weldability Study of Resistance Spot Welds 'Steels' 2004 Sydney H. Melbourne Award for Excellence in the Advancement of Automotive Steel
The award recognizes authors who effectively demonstrate ways to further the use of sheet steel in automotive applications, and is named after the late Sydney H. Melbourne of Dofasco, Inc., recognized widely for his achievements within the steel and automotive industries.
Through this new thinking on weldability issues -- as well as the papers submitted by previous award recipients -- the steel industry is able to demonstrate year-after-year the benefits, adaptability and efficiency of steel in automotive applications."
sev.prnewswire.com /auto/20050413/CLTU04412042005-1.html   (908 words)

  
 Tenaris Pipeline Services -> Research & Development -> Case Study: Weldability
To evaluate the weldability of latest generation Tenaris LP, using different welding methods.
Special focus is made on offshore methods, which are critical from the point of view of the resulting mechanical properties.
To generate a Tenaris historical weldability database, available to customers through the internet.
www.tenaris.com /en/ProductsServices/Pipeline/research_development_04weld.asp   (103 words)

  
 Metal ID, Metal Weldability   (Site not responding. Last check: 2007-11-01)
The property of machinability and weldability is the ease or difficulty with which a material can be machined or welded.
Magnesium is an extremely light metal, is white in color, has a low melting point, excellent machinability, and is weldable.
It has a very low kindling point and is not very weldable, except when it is alloyed with manganese and aluminum.
www.weldguru.com /metal-id.html   (17360 words)

  
 weldability.com | the weld-wise web
We take your privacy very seriously and do our best to ensure that any personal information we obtain about you is stored and dealt with in the best possible way.
weldability, is owned by the WWS Group ("the Group"), as part of a limited company, incorporated in England.
weldability maintain a mailing list for the purpose of distributing our newsletters and advertising material.
www.wholeweld.co.uk /weldability/home.asp?page=privacy   (1035 words)

  
 Numerical Analysis of Weldability
With the 8th International Seminar ‘Numerical Analysis of Weldability’, a tradition of successful meetings will be continued.
Since the first of these events in 1991, this seminar series has developed to be a world leading conference in the growing field of the development of methods for predicting the microstructure and properties of welds.
Mathematical models describing the weldability are based on the fundamental physical mechanisms involved and shall finally describe the influences on the performance of the weldment using numerical methods.
www.iws.tugraz.at /IWS_tree/Veranstalt/Seggau/2006/e_seggau_scope.html   (279 words)

  
 General description and weldability of Non-Ferrous Metals   (Site not responding. Last check: 2007-11-01)
It is applicable to all weldable base alloys and all filler alloys.
Due to the high thermal conductivity of copper, the welding currents are higher than those required for steel, and preheating of the base metal is necessary.
The weldability of each copper alloy group by this process depends upon the alloying elements used.
www.arcraftplasma.com /nonferrous.htm   (13710 words)

  
 Considerations for the Weldability of Types 304L and 316L Stainless Steels
The effects of sensitization are a loss in corrosion resistance due to chromium depletion and a loss of fracture toughness due to precipitation of complex carbides within and along HAZ grain boundaries.
In addition to considering the solidification mode of 300 series SS for cracking susceptibility, one must also consider the effects of sulfur and phosphorus on weld penetration and weld cracking, as indicated by Figure 2.
Descriptions of the mechanisms are beyond the scope of this document suffice to say that very low sulfur stainless steels (less than ~50 ppm) exhibit poor or intermittent penetration and unstable weld pool control.
sti.srs.gov /fulltext/ms2001544/ms2001544.html   (3974 words)

  
 Stainless Foundry & Engineering, Inc.   (Site not responding. Last check: 2007-11-01)
Weldability: Generally very good; fully austenitic grades may require special procedures.
Weldability: Should be welded in soft condition, then re-solutioned and re-aged.
Weldability: Fair to excellent, depending on grade and condition.
www.stainlessfoundry.com /Alloys.asp   (413 words)

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