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0 IntroductionSelf-shielded flux cored wire is a newly developedwelding material used without gas protection. Use of suchcored wires has grown rapidly in developed countriesbecause of the following advantages: simple use, goodwind resistance ability, lower cost resulted from highproductivity and strong desulfurization ability[1]. Self-shielded flux cored wires are preferred for on-site weldingsuch as ship and barge building, storage tank, bridge,offshore oil platform buildings and so on[2 -3].… 相似文献
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通过自制的5种药芯成分不同的自保护药芯焊丝,研究氟化钡和氟化钙的不同配比对焊接工艺性能、过渡熔滴、熔敷金属中P、Si的控制的影响。结果表明,随着:BaF2占氟化物总量的增加,立焊性能改善,焊接过程飞溅、烟尘减少,累积质量分数为50%时的熔滴的平均直径减小,而熔敷效率和Hmax/Bmax降低(Hmax为焊缝最大熔深,Bmax为焊缝最大熔宽)。BaF2比CaF2控制熔敷金属中P、Si含量的能力更强,并通过热力学分析解释了氟化物对熔敷金属中P、Si控制的机理。综合考虑焊接工艺性能和熔敷金属中P、Si的控制,药芯中选用BaF2占氟化物总量的75%~87.5%较为合适。 相似文献
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对汽车冲压生产中开卷落料模的应用进行了阐述,重点介绍了开卷落料模应用的意义,并从开卷落料模的排样、废料槽设计原则、托料机构形式和推料器等方面进行了详细的介绍。 相似文献
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本文采用无粗晶区半焊道法,以药芯焊丝这种新型焊接料将可焊性较差的ZG40Mn2钢与20g钢的焊接变为可焊性较好的500MPa级低合金钢与20g钢的焊接,保证了焊接接头的质量。这种焊接工艺方法也可适用于其相应强度级别的异种钢的焊接。 相似文献
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The role of atomic hydrogen and hydrogen-induced martensites in hydrogen embrittlement in slow strain rate tensile tests and hydrogen-induced delayed cracking (HIC) in sustained load tests for type 304 L stainless steel was quantitatively studied. The results indicated that hydrogen-induced martensites formed when hydrogen concentration C0 exceeded 30 ppm, and increased with an increase in C0, i.e. M(vol%) =62-82.5exp( - C0/102). The relative plasticity loss caused by the marten-sites increased linearly with increasing amount of the martensites, i.e. Iδ(M),% = 0.45M(vol %) = 27.9-37.1 exp( -C0/102). The plasticity loss caused by atomic hydrogen Iδ(H) increased with an increase in C0 and reached a saturation value Iδ(H)max = 40% when C0 > 100 ppm. Iδ( H) decreased with an increase in strain rate E , i.e. Iδ (H), % = - 21.9 - 9. 9(?), and was zero when (?)≥(?)c = 0.032/ s. HIC under sustained load was due to atomic hydrogen, and the threshold stress intensity for HIC decreased linearly with lnC0, i.e 相似文献