AWS D11.2/D11.2M:2025 covers cast iron metallurgy, weldability, welding processes, repair, qualification, surfacing and quality control.
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AWS D11.2/D11.2M:2025, Guide for Welding Iron Castings, provides technical guidance for joining, repairing, surfacing and evaluating iron castings. The publication addresses the wide range of metallurgical and welding characteristics found within the cast iron family and provides practical guidance for selecting welding processes, filler metals, heat-control practices, joint designs and qualification methods appropriate to specific cast iron applications.
The 2025 publication is the second edition of the guide and revises AWS D11.2-89 (R2006), the first edition originally published in 1989. It was prepared by the AWS D11 Committee on Welding Iron Castings and is published as an American National Standard.
The guide recognizes that the term cast iron covers a family of ferrous alloys having substantially different metallurgical, mechanical and physical characteristics. Chemical composition, graphite form, matrix structure, strength and hardenability can vary widely among cast iron grades, and those differences directly affect welding behavior.
AWS D11.2/D11.2M therefore addresses relative weldability, suitable filler metals, welding and thermal processes, qualification practices and quality-control requirements rather than assuming that one welding procedure is appropriate for every cast iron product.
AWS describes D11.2/D11.2M primarily as a guide rather than a prescriptive fabrication code. Its recommendations represent current technical practice for welding iron castings.
Mandatory wording can nevertheless appear where failure to follow a particular instruction or procedure could result in inferior, misleading or unsafe results. Users must therefore apply the document together with applicable engineering requirements, purchase specifications, repair requirements and governing codes.
Clause 4 begins with the metallurgy of iron castings. Understanding graphite morphology, matrix structure, carbon content and alloying effects is fundamental to evaluating weldability because cast iron responds differently to rapid heating and cooling than common wrought steels.
The guide illustrates and discusses several major forms of iron casting microstructure, including gray iron, white iron, malleable iron, ductile iron and compacted graphite iron.
Gray iron contains graphite primarily in flake form. The graphite morphology and surrounding ferritic or pearlitic matrix influence strength, machinability, thermal behavior and response to welding.
The guide includes microstructural examples and weldability information specific to gray iron, including the effects of welding and preheat on the heat-affected zone.
White iron differs significantly from gray iron because much of its carbon is retained in combined form as iron carbide rather than appearing as free graphite. Its hard and brittle structure presents particular difficulties when welding or repairing cast components.
Malleable iron contains temper-carbon nodules formed through heat treatment of suitable cast iron. The guide includes metallurgical examples and weldability-test information applicable to malleable iron materials.
Ductile iron uses nodular or spheroidal graphite morphology and can provide substantially greater ductility and strength than conventional gray iron. The guide includes microstructures, welding examples and weldability-test information for several ductile iron grades.
Compacted graphite iron has graphite morphology intermediate between flake and nodular forms. The second edition includes material addressing this cast iron family and illustrates the characteristic weld and heat-affected-zone microstructure.
Cast irons can present significant welding challenges because of high carbon content, local hardening, thermal stresses, limited ductility and the possibility of cracking in the weld or heat-affected zone.
Successful welding therefore requires consideration of the specific casting type, section thickness, restraint, filler metal, heat input, preheat, interpass temperature, cooling rate and intended service of the repaired or fabricated component.
Clause 4 includes an AWS weldability test program developed to help assess whether a particular iron casting can be welded successfully under proposed conditions.
The guide relates no-crack temperature to material type, strength, composition and weld or heat-affected-zone hardness. This provides a practical method for evaluating the thermal conditions needed to reduce cracking risk during welding.
Where material identity or welding response is uncertain, the guide addresses preweld testing as a means of evaluating the casting before committing to a production repair or fabrication procedure.
This can be especially useful for older components, service-exposed castings or items for which original foundry and material records are unavailable.
Clause 5 addresses preparation of iron castings before welding. Successful repair depends on removal of defects, contaminants, oil, scale and damaged material so that welding is performed on suitable base material.
Preparation requirements vary with the type and depth of damage, casting geometry, joint configuration and selected welding process.
The guide provides recommended joint-design concepts for iron castings, including complete joint penetration and partial joint penetration groove configurations.
Joint geometry must permit adequate access, fusion and filler-metal deposition while managing restraint and heat concentration within a material that can be sensitive to cracking.
Heat input is a major consideration when welding cast iron because the thermal cycle affects heat-affected-zone hardness, residual stresses, cracking susceptibility and metallurgical transformation.
The appropriate level of heat input depends on the material, process, section thickness, filler metal and whether a hot-welding or lower-heat repair technique is being used.
Clause 5 includes detailed guidance on preheat. The publication provides recommended preheat and interpass temperatures for welding cast irons and illustrates the influence of preheat on gray iron heat-affected zones.
Preheat can reduce temperature gradients and cooling rates, but the required temperature must be selected according to the casting material, welding process, filler metal and repair objective rather than applied as a universal value.
The guide addresses electrode manipulation and peening as practical techniques used during cast iron welding.
Peening can be used in appropriate procedures to influence contraction stresses within deposited weld metal, but its application must be controlled so that it does not damage the weld or surrounding casting.
Cooling rate can have a major effect on cracking and hardness after welding iron castings. Clause 5 therefore addresses controlled cooling as part of the overall welding procedure.
Rapid uncontrolled cooling can increase thermal stress and promote hard or brittle microstructures in susceptible cast irons.
The guide includes postweld heat treatment as another thermal-control option where required by the material, service conditions or selected repair procedure.
PWHT can be used to modify residual stresses or metallurgical condition, but its applicability depends on the specific casting and repair requirements.
Clause 6 addresses gas-based processes applicable to iron castings. These include oxyfuel welding, flame spraying of gray iron and braze welding.
Oxyfuel welding can provide relatively broad and controllable heat distribution and has historically been used for welding certain cast irons. The guide addresses equipment, filler materials and technique considerations for these applications.
The document includes flame spraying of gray iron as a specialized repair or restoration process where deposited material is applied to prepared cast surfaces.
Braze welding is covered as an alternative joining or repair technique for iron castings. The guide includes chemical compositions and application information for rods and electrodes used in braze welding.
Clause 7 covers the principal arc welding processes used for iron casting repair and fabrication. Each process has different heat-input, filler-metal, deposition and shielding characteristics that must be matched to the casting and repair objective.
SMAW receives detailed treatment because it is widely used for repair welding of iron castings. Electrode selection, welding technique, heat control and bead sequence can significantly influence repair quality.
GMAW is addressed for applicable cast iron welding operations. The process can provide controlled filler-metal deposition but requires appropriate filler material, shielding and procedure qualification.
FCAW is included among the arc welding processes discussed in the guide. The suitability of a particular flux cored product depends on the casting type, required deposited metal properties and repair procedure.
GTAW is covered for applications requiring precise heat and filler-metal control. The guide uses GTAW examples in its weldability-test discussion, including spot and bead tests on ductile iron.
SAW is also addressed for applicable iron casting welding operations where joint geometry, production conditions and filler-metal systems make the process suitable.
The guide provides chemical-composition information for filler metals used in welding iron castings and discusses selection according to base metal, process and service requirements.
Filler-metal choice can strongly affect weld-metal machinability, strength, ductility, thermal expansion behavior and dilution with the cast iron base material.
Clause 8 addresses surfacing and overlaying of iron castings. Surfacing may be used to restore dimensions, provide wear resistance, improve surface properties or repair damaged areas.
The guide covers thermal spraying and other surfacing processes, surfacing materials and application technique.
Clause 9 addresses practical applications of welding and related processes to iron castings.
Welding can be used to repair defects originating during manufacture of a casting. Repair procedures must consider defect removal, base-metal soundness, casting grade, joint preparation and quality requirements.
The guide separately addresses defects or dimensional problems created or discovered during machining. Repair must restore the required geometry while maintaining acceptable metallurgical and mechanical properties.
Castings that have been in service can present additional challenges such as contamination, cracking, wear, thermal exposure or unknown prior repairs. The guide provides application guidance for evaluating and repairing service-exposed castings.
Welding can also be used as part of fabrication involving iron cast components rather than solely as a repair method. Procedures must be appropriate to the casting material and intended service.
Clause 10 and Normative Annex A establish requirements and recommended steps for welding procedure qualification when qualification is necessary.
The qualification provisions include test positions, groove and fillet weld configurations, soundness testing, tensile testing and documentation through a Welding Procedure Specification and Procedure Qualification Record.
The guide also provides performance qualification provisions for welders and welding operators. Qualification demonstrates the ability to deposit acceptable welds using the applicable procedure, process and test configuration.
Normative Annex A includes test positions and performance qualification test arrangements for groove and fillet welds.
The publication includes suggested forms for documenting a Welding Procedure Specification, Procedure Qualification Record and Performance Qualification Test Record.
These forms provide a structured method of recording the essential information used to establish and maintain qualification documentation.
Clause 11 addresses quality control practices for welds in iron castings. Quality control includes planning, surveillance, inspection and documentation appropriate to the service and quality level required for the repaired or fabricated component.
The guide includes acceptance criteria associated with quality-control activities and provides a system for establishing quality levels for welds in iron castings.
Normative Annex B contains the classification system for welds and associated quality levels, including acceptance criteria for magnetic particle testing, dye penetrant testing and visual examination.
The publication includes a form for documenting weld repairs and tables describing surveillance recommendations. Documentation supports traceability of repair location, procedure, personnel, inspection and disposition.
Annex A provides the detailed welding procedure and personnel qualification framework. It includes qualification test positions, groove and fillet weld soundness tests, tensile specimen configurations and suggested qualification records.
Annex B establishes a system for classification of welds in iron castings and associated quality levels. It provides quality-control requirements and acceptance criteria for selected inspection methods.
This annex gives engineers and purchasers a structured way to define the level of weld quality appropriate to the component and service conditions.
Annex C provides detailed information concerning the AWS weldability test. The annex includes test blocks for gray, ductile and malleable iron and supporting mechanical-property and hardness information.
Annex D contains examples showing how welding and repair guidance can be applied to actual iron casting situations. Application examples help connect the metallurgical and procedural material in the main clauses with practical repair work.
Annex E provides informative technical references, while Annex F explains the process for requesting an official AWS interpretation.
The publication also contains a list of related AWS documents concerning welding of iron castings.
The 2025 second edition is the first full revision of the guide since the original 1989 publication, which was later reaffirmed in 2006. The new edition retains the established cast iron weldability and repair focus while reorganizing and updating the material into current AWS format with dual U.S. Customary and SI units, normative references, formal qualification provisions and a structured weld quality classification system.
AWS has already initiated work on a future revision of D11.2/D11.2M. That development project does not supersede the published 2025 second edition. As of November 2026, AWS continues to list D11.2/D11.2M:2025 as its current published Guide for Welding Iron Castings.
Cast iron welding cannot be approached as though every casting were simply another carbon-steel component. Graphite form, carbon content, matrix structure, hardenability, casting history and service exposure can make two apparently similar castings behave very differently during welding.
AWS D11.2/D11.2M provides a structured approach beginning with metallurgy and weldability assessment, then carrying that information through joint preparation, heat control, filler-metal selection, process selection, qualification and final quality control. That combination makes the guide especially useful for repair work where the cost of an unsuccessful welding attempt can exceed the cost of the original defect.
AWS D11.2/D11.2M:2025 is the current published second edition of Guide for Welding Iron Castings and revises AWS D11.2-89 (R2006). AWS currently lists the 2025 edition among its active publications. A future revision project has been initiated, but no newer official AWS edition has replaced the 2025 publication.