Is Electric Spanner Useful? Selection of Electric Spanner電動扳手是給電源或蓄電池供電的扳手，是擰緊螺栓的工具。

　　Electric wrench is a wrench for power supply or battery power supply. It is a tool for tightening bolts.

　　主要用于鋼結構安裝行業(yè)，專門安裝鋼結構高強螺栓，高強螺栓是用來連接鋼結構的接觸面，通常采用螺栓組的方式。

　　Mainly used in the steel structure installation industry, special installation of steel structure high-strength bolts, high-strength bolts are used to connect the contact surface of steel structure, usually using the way of bolt group.

　　1、拉扳手用力要柔和均勻。永遠不要用短的沖力拉，因為一個猛拉會產生一個沖力，螺栓或螺栓可能在力停止的那一刻扭過頭了。
                          

　　1. Pull the wrench gently and evenly. Never pull with a short impulse, because a sharp pull produces an impulse, and a bolt or bolt may turn too far at the moment when the force stops.

　　2. 污染物會阻礙精確的扭矩值。如果部件和螺孔中有污染物，則不可能獲得正確的扭矩值。

　　2. Pollutants can hinder accurate torque values. If there are contaminants in the components and screw holes, it is impossible to obtain the correct torque value.

　　摩擦是一種普遍現(xiàn)象，但也有好的和壞的影響。好的部分是把這些部分放在一起;不好的一面是，當收緊時，可能會導致錯誤的結果。機械工人用手擰緊連接時，只有10%到20%的力是用來擰緊的。在許多情況下，40%到50%的扭矩用于克服螺栓頭和部件之間的摩擦。擰緊螺栓時應考慮所有這些摩擦因素和其他因素。

　　Friction is a common phenomenon, but it has both good and bad effects. The good part is to put these parts together; the bad part is that when tightening, it can lead to wrong results. When the mechanic tightens the connection by hand, only 10% to 20% of the force is used to tighten it. In many cases, 40% to 50% of the torque is used to overcome friction between the bolt head and components. All these friction and other factors should be taken into account when tightening bolts.

　　4. 當擰緊帶有損壞或堵塞螺紋的螺母或螺栓時，請注意通過損壞區(qū)域需要多少額外扭矩，并將此額外扭矩應用于建議的扭矩值。

　　4. When tightening nuts or bolts with damaged or blocked threads, pay attention to how much additional torque is required to pass through the damaged area and apply this additional torque to the recommended torque value.