| To my knowledge there is no limit for number of welder qualification upon one WPS, You can qualify as many as per to the requirement for your project. Here By, P.BalajiRajan, -------Original Message------- Sir, Minimum number of welders to be qualified upon one WPS is mentioned in SEC 1X or API 1104. We are using PIPE,16"X0.375"WT STD SCH API 5L X52 Thanks in advance with regards, Arun S Das |
Introduction The colour formed when stainless steel is heated, either in a furnace application or in the heat affected zone of welds, is dependent on several factors that are related to the oxidation resistance of the steel. The heat tint or temper colour formed is caused by the progressive thickening of the surface oxide layer and so, as temperature is increased, the colours change. Oxidation resistance of stainless steels However, there are several factors that affect the degree of colour change and so there is no a single table of colour and temperature that represents all cases. The colours formed can only be used as an indication of the temperature to which the steel has been heated. Factors affecting the heat tint colours formed Steel composition The chromium content is the most important single factor affecting oxidation resistance. The higher the chromium, the more heat resistant the steel and so the development of the heat tint colou...
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