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The American Welding Society (AWS) D 1.4 sets out the practices for welding rebar in the US. Without special consideration the only rebar that is ready to weld is W grade (Low-alloy — A706). Rebar that is not produced to the ASTM A706 specification is generally not suitable for welding without calculating the "carbon-equivalent".
Many metals and thermoplastics can be welded, but some are easier to weld than others (see Rheological weldability). A material's weldability is used to determine the welding process and to compare the final weld quality to other materials. Weldability is often hard to define quantitatively, so most standards define it qualitatively.
An example of a heat number on a plate. A heat number is a unique identification coupon number that is stamped on a material plate after it is removed from the ladle and rolled at a steel mill.
In welding, equivalent carbon content (C.E) is used to understand how the different alloying elements affect hardness of the steel being welded. This is then directly related to hydrogen-induced cold cracking, which is the most common weld defect for steel, thus it is most commonly used to determine weldability.
The EN 10080: Steel for the reinforcement of concrete is a European Standard.This standard is referenced by EN 1992.This standard specifies general requirements and definitions for performance characteristics of steel reinforcement suitable for welding, which is used for reinforcement of concrete structures, supplied as finished products:
Structural welding (reinforcing steel) AWS D1.5: Bridge welding AWS D1.6: Structural welding (stainless steel) AWS D1.7: Structural welding (strengthening and repair) AWS D1.8: Structural welding seismic supplement AWS D1.9: Structural welding (titanium) AWS D3.6R: Underwater welding (Offshore & inland pipelines) AWS D8.1: Automotive spot ...
In addition to the above category codes there are symbols that can be added to the grade code to identify any additional compositional requirements, delivery conditions, mechanical properties, &c. These values depend solely on the type/application code given in the first part of the code and are so numerous as to be impossible to indicate here.
The symbolic representation of a V weld of chamfered plates in a technical drawing. The symbols and conventions used in welding documentation are specified in national and international standards such as ISO 2553 Welded, brazed and soldered joints -- Symbolic representation on drawings and ISO 4063 Welding and allied processes -- Nomenclature of processes and reference numbers.