What Need to Pay Attention When Using a Electric Wrench?

Electric wrench is a tool to tighten the bolts which to the power supply or battery powered wrench. Electric wrench is mainly used in steel industry installation, and used to install steel structure high strength bolts. The high strength bolts are used to connect steel contacts, usually occurs by way of a bolt group.

Introduce the attentions in use of electric wrench:
1, Pull electric wrench force should be uniform and soft, absolutely do not use short, impulsive force to turn. Because the tug will produce an impulse, at the stop force moment, the screw or bolt may have been twisted too far.

2, Contaminants can interfere with accurate torque values. If parts or screw has the pollutant, then we will not get the correct torque value.
3, Friction is a common phenomenon, but there are two aspects of the role of good or bad. The good news is keeping parts together; the bad news is that in the tightening, it may lead to erroneous results. A mechanic hand tight connection with only 10% - 20% for tension, and in many cases, 40% - 50% of the torque is used to overcome the friction between the bolt head and the parts of, along the screw bolt and a screw hole of the spouse thread surface also produce additional friction. So when tightening the bolts, all these friction factors and other factors should be taken into account.

4, Tighten the screw thread on the injury or obstacle of the nut or bolt, to pay attention to the need for additional torque through the damaged parts of the site to be added to the recommended torque value.

Source: What Need to Pay Attention When Using Electric Wrench?
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