熔焊

Double-U curves of laser welding mode transition have been obtained, which can be used to determine the process parameters of the three mentioned welding processes.

标 签 激光焊接深熔焊热导焊焊接模式转变 laser welding deep penetration welding heat conduction welding welding mode transition

Those are uniform heat source, double ellipsoidal heat source and the combined heat source.

系统地模拟和讨论了热源模型、试板尺寸、焊接速度和线能量对激光深熔焊残余应力的影响，阐述了激光深熔焊残余应力的形成与演化过程。

The cathode phenomena in hollow cathode arc discharge in vacuum wereinvestigated systematically. The influence of welding parameters on active zone ofhollow cathode , arc appearance and voltage-ampere curve was investigated.

小电流的发散态电弧能量密度低，柔性大，可作为局部加热热源进行真空钎焊；大电流的可作为理想的熔焊热源，进行各种难熔易氧化金属在真空条件下的高质量焊接。

Prior to welding, check welding voltage, time, etc to see whether they are in compliance with requirements by electrofusion fitting.?

焊接之前要核验焊接电压、时间等熔焊参数是否与电熔管件所需求的一致。

The heat of fusion welding is generated in several ways,depending on the sort of metal which is being welded and on its shape.

熔焊的热度有几种来源，取决于被焊金属的种类及其形状。（注重的是翻译出语言的简练

It can be used to weld aluminum alloys and titanium alloys, which are difficult for fusion welding. It especially has great potentials in friction welding of non-axisymmetric components.

它可以焊接通常用熔焊方法难以焊接的铝合金、钛合金等，尤其是在非轴对称焊件的摩擦焊中拥有巨大潜力。

The joining processes covered include soldering, brazing, solid-phase welding and fusion welding.

在加入进程涵盖焊接，钎焊，固相焊和熔焊。

Effects of arc welding processes,welding parameters as well as chemical compositions and mechanical properties of the base metal on arc efficiency ,melting efficiency and heat input for fusion welding processes are analyzed.

介绍了电弧焊过程热效率的物理含义及熔焊过程热效率的研究概况，比较了不同熔焊过程的热效率，分析了焊接方法、焊接参数及母材成分与性能对熔焊过程的电弧热效率、熔化效率及焊接热输入的影响规律。

Gas-operated welding blowpipe,high-pressure-type,hand-held

气动熔焊喷焊器，高压型，手持式

It shows that the strength and the elongate rate of joint increased earlier and then decreased with the welding velocity increasing,when the welding velocity was 200 mm/min the strength was highest (coefficient was 67%).

用这种连接方法能避免熔焊时的缺陷，得到的接头变形小、强度高，能焊接所有牌号的铝合金，包括以前被认为不可焊的铝合金[2，3]。

Cynanchum Lingtai apricot production in the average weight 65 grams, the brightly-colored fruit, juicy rich, sweet-sour taste, sweet from the nucleolus, when the late Qing Dynasty famous Shaanxi, Gansu provinces, the Qing imperial court Tongzhi tribute for years.

灵台生产的牛心杏平均单果重65克，果实色泽鲜艳，汁多味浓，甜酸适口，离核仁甜，清末时就驰名陕、甘两省，清同治年间曾为朝廷贡品。

Chenopodium album,Solanum nigrum, and Amaranthus retroflexus were very susceptible to the herbicides. Polygonum persicaria and Abutilon theophrasti were relatively less susceptible to the herbicides, and Lycopersicon esculentum was not susceptible to it. The relationship between reduction rates of weed biomass and PPM values of weed leaves 2,4, and 6 days after treatment was established.

供试的6种杂草对该混剂的敏感性存在显著差异：红心藜Chenopodium album、龙葵Solanum nigrum和反枝苋Amaranthus retroflexus对该混剂最敏感，ED90值分别为47.65、71.67和29.17g/hm2；春蓼Polygonum persicaria和苘麻Abutilon theophrasti敏感，ED90值分别为96.91、114.20g/hm2；而番茄不敏感。