| Welding cold-rolled steel to cast iron
Dear Elmer: Is there a way to weld 1018 cold-rolled steel to cast iron? If so, how? James Dear James: You can weld 1018 low-carbon steel to cast iron using shielded metal arc welding (SMAW) and a nickel-based ENiFe electrode. Clean the surfaces before you start. If the joint is highly restrained or if the casting is thick, you might need to preheat the casting. Preheating reduces the cooling rate, residual stress, distortion, and the tendency for cracking. Use short stringer beads. Don't overheat the base metal. The maximum interpass temperature is 600 degrees F. Peening sometimes is used to relieve stress if cracking is a problem. Peening is a mechanical working of metals using impact blows. Peening while the weld deposit is still warm (or as it cools) can help to improve the properties of the deposit and help refine the metallurgical structure. It also assists in relieving shrinkage stresses and in correcting distortion. Peening works the metal and expands it, which counteracts the shrinkage (which causes the cracking) that occurs or may occur during the cooling. | | ||||||
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Piping systems involved for the flow lines and gathering lines from the well head isolation valve to the production facility or processing plant isolation valve are determined as OFF PLOT. ON PLOT defines piping system in the processing plant and production platform. ANSI/ASME B31.4 applies for off plot piping system. B31.4 allows the use of either API 1104 or ASME section IX (as appropriate). However, occasionally, a very small system such as piping within 500 feet of a processing plant (some client also said 400 feet) may be declared B31.3 rather than B31.4. When B31.3 is invoked, only ASME Section IX is used. before you decide which code to use for welding procedure and/or welder qualification for pipe welding, you have to know the design and construction code applicable to the system. Please read far enough into scope and diagram illustrating the application of either B31.3 and B31.4 hope this helps rgds 2011/4/21 pradip kumar sil < pradipsil@gmail.com > Dear all, ...
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