钢结构焊接技术及火焰矫正（Welding technology and flame rectification of steel structure）.docVIP

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钢结构焊接技术及火焰矫正（Welding technology and flame rectification of steel structure）.doc

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钢结构焊接技术及火焰矫正（Welding technology and flame rectification of steel structure） Specification for flame straightening I. Basic parameters of flame correction Flame rectification basic parameters are: heating temperature, oxygen and propane flame combustion ratio, heating rate, cooling rate and flame rate etc.. Flame heating temperature Flame correction, according to the material, thickness and heating methods, and so on, choose different heating temperature. It can be divided into low temperature heating, medium temperature heating and high temperature heating. The low temperature heating The heating temperature is 500~600 degrees centigrade. Suitable for heating plates with a thickness of less than 6mm. Flame straightening of carbon and low-alloy high strength steel suitable for carbon content greater than 0.25%. Low temperature heating allows watering (clean water) cooling. The temperature in the heating Heating temperature is 600~700 degrees, suitable for heating plate thickness 6 ~ 12mm steel plate. For carbon and low-alloy high-strength steels with carbon content greater than 0.35%, the heating temperature shall be controlled accurately, and temperature measuring pens or temperature measuring instruments shall be adopted, and shall not exceed 723 degrees centigrade. 3 high temperature heating The heating temperature is 723~850 degrees, suitable for heating large plate, the thickness is 14 ~ 16mm, the heating temperature is 750~800 degrees centigrade, the thickness is greater than 20mm, and the heating temperature is 850 degrees centigrade. Carbon content greater than 0.35%, steel and alloy high strength steel can not be corrected by high temperature heating. Control of heating temperature in flame rectification. For low carbon steel, the range of heating temperature is wide. The heating temperature can be approximately estimated by observing the heating color of the steel. Surface colour of steel and its corresponding temperature Color temperature / C color tempera