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Investigation on mechanism of fixing nitrogen in self-shielded flux cored arc welding 总被引:1,自引:0,他引:1
Prevention of nitrogen porosity in weld metal deposited with self-shielded flux cored wire with CaF_2-TiO_2-MgO slag system can be accomplished by using a "killing agent" such as titanium to react with nitrogen dissolved in the weld metal. The amount of titanium needed to prevent porosity is calculated thermodynamically for various dissolved nitrogen levels. Experimental flux cored wires are used to verify the thermodynamic model. It is concluded that approximately O.11 wt% titanium in the weld deposit is need to prevent nitrogen porosity when welding without externally applied shielding. 相似文献
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对药芯焊丝在船舶焊接中常见缺陷的产生机理和影响因素进行更深入的研究,从选材、焊接工艺和现场控制等提出防止措施,三英公司新研制的高质量SQJ501L药芯焊丝对于减少焊接缺陷的产生,提高船舶焊接质量起到重要作用。 相似文献
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3.药芯焊丝角焊缝冷裂纹防止对策 为防止药芯焊丝角焊缝出现冷裂纹,从选材、控制焊接工艺、适当预热三方面提出有效措施(如图7所示)。选材上,要限制母材的碳当量,要限制焊丝的成分或强度。HIO级别的焊丝扩散氢含量越低越好,优选H5级别的焊丝;要控制保护气体的纯度,限制气体的露点。控制焊接工艺方面,焊接冷裂敏感性较大的接头时,要控制焊接电流和干伸长度,确保气保护效果尤其是现场防护、焊机、气阀、把线等是否能正常。焊接高拘束度、大板厚的结构,可以适当增加预热。 相似文献
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