Numerical simulation and analysis of the droplet speading under arc brazing 電弧釬焊條件下的熔滴鋪展的數值模擬與分析
Specific surface of droplet 熔滴比表面積
Study on flame - retardant and anti - dripping of a novel organic phosphate for the treatment of polyester fabrics 新型有機磷酸酯對滌綸織物的阻燃和抗熔滴研究
Tests on electric and optical fibre cables under fire conditions - part 1 - 3 : test for vertical flame propagation for a single insulated wire or cable - procedure for determination of flaming droplets particles 著火條件下電纜和光纜的試驗.第1 - 3部分:單根絕緣電線或電纜垂直火焰蔓延的試驗.火焰熔滴顆粒測定規程
Tests on electric and optical fibre cables under fire conditions - part 1 - 3 : test for vertical flame propagation for a single insulated wire or cable - procedure for determination of flaming droplets particles 著火條件下電纜和光纜的試驗.第1 - 3部分:單根絕緣電線或電纜垂直火焰蔓延的試驗.火焰熔滴顆粒測定規程
As plasma , welding arc has well electric character . exterior magnetic field can affect shape and movement of welding arc . and the welding bead and drops transfer can also be changed to improve the welding process and advanced the productivity 電弧作為一種等離子體,具有優良的導電性,用外部磁場可以改變電弧的形態和運動特性,影響焊縫熔池和熔滴過渡形式,大大改善焊接工藝,提高焊接生產效率。
It pointed out the copoly - merization with phosphorus - containing flame retardant and monomers naphthylenediol , naphthylene diacid and glycerol together with the dosages of nano - particles and layered structure silicates would be a viable route to anti - dripping to flame retardant polyester fibers 指出:磷系共聚阻燃改性技術輔以其它反應性單體、納米添加劑等有利于改善滌綸的抗熔滴性和炭化阻燃作用。
It has important significance to study the welding technology of variable polarity pulsed mig for high efficiency weding and good quality of welding products . we should control the welding current , output voltage and the process of melting drop more effectively 研究薄板鋁合金變極性脈沖mig焊接技術,更有效地控制焊接電流、電壓輸出和熔滴過渡過程,提高焊接過程的穩定性、提高焊接速度,對于提高焊接效率和焊接產品質量具有重要的意義。
The results show that the sinters for the bf in shuicheng iron and steel co . , ltd . have middle rdi ( low temperature reduction degradation index ) , choice ri ( reduction index ) , wider softening temperature range , high start melt and dropping temperature , smaller melt and dropping temperature range 研究結果表明,水鋼燒結礦具有中等及中等偏下的低溫還原粉化性能和優良的還原性能;軟化區間偏寬,開始熔化溫度高和開始滴落溫度高,卻有較窄的熔滴區間。
Transitional feature of the arc and metal droplet in the welding process with steam shielded arc is investigated by means of analysing the waveforms of welding voltage and current under different welding regimes and it is found that there are two types of arc process behavor ? " arc starting - arc blowing out - short - circuiting " and " arc - starting - short - circuiting " . under the condition of constant diameter of welding wire and its feeding speed , the arc process behavor can be changed by adjusting the inductance of welding circuit as well as the voltage of power supply . if arc process behaves as alternative process of " arc starting - arc blowing out - short - circuiting " with minimum time duration of arc blowing out and maximum frequency of short - circuit transition , the welding process will be stable with less spatter and smooth weld bead 通過分析不同焊接規范下的焊接電壓和電流的波形.研究了水蒸氣保護下電弧及熔滴過渡的特點,發現其電弧過程行為有“燃弧?熄弧?短路”和“燃弧?短路”兩種形式.在焊絲直徑和送絲速度一定的情況下,通過調節焊接回路中的電感量和電源電壓,可以改變電弧的過程行為形式.若電弧過程呈“燃弧?熄弧?短路”交替進行,并且熄弧時間最短時,短路過渡頻率最高,在這種情況下,飛濺小,焊道成型好,焊接過程穩定