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0发明概述建筑法令中规定,火灾时焊缝金属必须具有承受大于350℃温度的能力,而建筑物使用的钢材和焊缝350℃时的屈服强度为常温的60%~70%,为避免建筑物倒塌,不得不使用防火涂料。例如,焊缝表面除喷镀熔渣棉、玻璃棉、石棉等防火材料和铺毛毡外,还要包覆防火灰浆以及在绝热层上铺设金属薄膜,对铝、不锈钢、钢薄板等建材实施严格保护措施,在火灾时,防止热的损害。但是耐火涂覆工程费比焊接材料价格还
0 SUMMARY OF THE INVENTION The Building Code stipulates that in the event of a fire, the weld metal must have the ability to withstand temperatures greater than 350 ° C, whereas steel and weld seams used in buildings yield a yield strength of 60% to 70% at ambient temperatures at 350 ° C. Things collapsed, had to use fire retardant paint. For example, the weld surface in addition to spraying slag wool, glass wool, asbestos and other fire-resistant materials and paving blankets, but also coated with fireproof mortar and insulation film laying on the metal, aluminum, stainless steel, steel sheet and other building materials to implement strict Protection measures, in the event of fire, to prevent heat damage. However, refractory coating project cost more than welding materials