高校问答梦幻诛仙鬼王加点攻略:哪个高手帮翻译一篇英语，谢谢
来源：百度文库 编辑：高校问答 时间：2024/05/06 08:36:29
In Fig.25.24(a) is shown the initiation of arc. Under the intense heat of the arc, the electrode tip melts and forms a globule of molten metal at the tip as shown in Fig.25.24(b). As the electrode wire is fed towards the workpiece, the molten tip touches the weld metal pool and thus short circuits the electrode to the workpiece as in the Fig.25.24(c).This reduces the voltage across the arc. The short circuits the electrode pinched as shown in Fig.25.24(d)by the surface tension of the weld metal pool as well as the magnetic force due to the current flow. Finally, the metal in pinched away and the arc getd ignited again, and the cycle is repeatde all over again.
The number of times that the pinching takes place, depends on the inductance of the welding machine used and the parameters set. The inductance of the welding machine controls the rate at which the short circuiting current increases. Too low an inductance gives rise to a very high short circuiting current and consequently high pinching rate. With high inductance, the short circuit current becomes low and results in somewhat lower pinching force. The effect of inductance, measured in terms of the reponse rate ,is given in Table 25.8 for the commonly used electrode diameters. It can ben observed that the optimum response rate depends on the electrode wire size .Hence, the welding machines to be used for short circuiting transfer, make use of a variable choke system which can be tuned for different wire sizes, The frequency of the metal transfer may be of the order of 50 to 200 per second. This rate also depends on the open circuit voltage and the wire feed rate employed. Too high an open circuit voltage reduces the frequency of short circuiting . The low wire feed rates also make for lower frequencies . The optimum values of these parameters are to be obtainde for any welding situation either through experience or by trial and error method, with some starting point from the welding machine manual.
The main advantage of using the short circuit metal transfer is the lower penetration which can be effectively used for welding thin sheets. Poorly fit joints as well as all difficult to reach positions can also be successfully welded. Practically, there is no spatter since the metal is transferred only when the electrode touches the workpiece, Also, less amount of metal is affected around the weld joint because of the smaller heat input .
The number of times that the pinching takes place, depends on the inductance of the welding machine used and the parameters set. The inductance of the welding machine controls the rate at which the short circuiting current increases. Too low an inductance gives rise to a very high short circuiting current and consequently high pinching rate. With high inductance, the short circuit current becomes low and results in somewhat lower pinching force. The effect of inductance, measured in terms of the reponse rate ,is given in Table 25.8 for the commonly used electrode diameters. It can ben observed that the optimum response rate depends on the electrode wire size .Hence, the welding machines to be used for short circuiting transfer, make use of a variable choke system which can be tuned for different wire sizes, The frequency of the metal transfer may be of the order of 50 to 200 per second. This rate also depends on the open circuit voltage and the wire feed rate employed. Too high an open circuit voltage reduces the frequency of short circuiting . The low wire feed rates also make for lower frequencies . The optimum values of these parameters are to be obtainde for any welding situation either through experience or by trial and error method, with some starting point from the welding machine manual.
The main advantage of using the short circuit metal transfer is the lower penetration which can be effectively used for welding thin sheets. Poorly fit joints as well as all difficult to reach positions can also be successfully welded. Practically, there is no spatter since the metal is transferred only when the electrode touches the workpiece, Also, less amount of metal is affected around the weld joint because of the smaller heat input .
在图25.24(A)被显示电弧的开始。 在电弧的强烈的热下， 电极信息如图25.24(b)中所示在端部融化并且形成一个熔融的金属的小球。 因为电极电线被对于工件供给， 熔融的信息接触焊接点金属水池，因此如同在图25.24(c)里对工件短路电极。 这穿过电弧降低电压。 电极如通过焊接点金属水池的表面张力的图25.24(d)中所示折磨的短路， 以及由于电流的磁力。 最后，在getd 再次点燃，并且循环重新是repeatde的被离开折磨和电弧里的金属。
折磨进行的次数，取决于使用的焊接的机器的电感，参数确定。 机器这个电感的那些焊接的那些比率在哪个那些增加短路电流。 一个太低的电感引起非常高的短路电流和从而高的折磨的比率。 由于高的电感，短路电流变得低并且导致有一些低的折磨的力量。 电感的影响，依据reponse 比率测量，被在通常使用的电极直径的表格25.8 给。 ben 观察最佳响应速度依靠电极电线尺寸它。 因此， 用于短路的焊接的机器转移， 利用可能被为不同的电线尺寸调试的一个易变的阻塞门系统， 金属的频率转移可能具有50到200 每秒的命令。 这个比率也取决于开的回路电压，电线供给量雇用。 一太高的开的回路电压降低短路的频率。 低的电线供给量也有利于更低的频率。 这些参数的最佳值是或者通过经验或者以检误法成为任何焊接的形势的obtainde， 由于来自焊接的机器手册的一些起始点。
使用金属转移的短路的主要优势是可能有效地用于焊接薄片的更低的洞察力。 不好，健康关节和全部难到达位置也能被成功焊接。 实际上， 没有溅， 因为金属只被转移， 电极接触工件什么时候，也，因为更小的热输入较少数额的金属在共同的焊接点周围影响。