The effects of the tested condition , e . g . environment humidity , drying temperature , dew point of shielding gas , etc , on diffusible hydrogen content of the domestic electrodes for welding mild and low alloy steels is analyzed and compared with that of the foreign electrodes 摘要采用水银法研究了环境湿度、烘干温度、保护气体露点等测试条件对焊缝扩散氢含量的影响,分析了我国碳钢及低合金钢焊条中的扩散氢含量,并且与国外焊条的扩散氢含量进行了对比。
The speed became fast at the temperature 1050 . the reaction could carry completely when billets was kept in vacuum tube for 3 hours " at 1050 temperature , under the striking of great quantity of heat when the molten iron poured into the mold , the reaction was blazed rapidly and continued at a high speed . the diffusible speed of v and c was very fast because the billet was heated over 1300 in a moment , so the reaction ca n complete in a few minutes ( 5 )碳化反应v + c vc在900左右开始发生,此时是固相反应,反应速度较慢,反应不能进行完全,随温度升高,该碳化反应的速度加快,在1050保温3小时可以进行完全,在铸造烧结时在过热铁水的巨大热流密度冲击下, v + c vc立即被激发,并以很快的速度进行,由于坯块被加热到1300以上,此时c和v扩散速度很快,因此铸造浇注后的几四川大学硕士学位论文分钟内反应可以进行完全。