Setting method for threading connection by means of impact wrench

A control method of an impact wrench for tightening a threaded connection, comprising the step of:

• in response to actuation of a pushbutton key, executing a sequence of consecutive phases which include:
• a first phase in which an impact mechanism of the impact wrench exerts a predefined number of rotary impacts on the threaded connection, and during the first phase, a profile of a rotational angle over time is estimated and a pattern is adapted to the profile and on a basis of the pattern a setpoint torque is determined for a second phase and a final rotation angle or a final number of impacts is determined for a third phase;
• the second phase in which rotary impacts are applied to the threaded connection until an estimated torque reaches the setpoint torque;
• and
• the third phase in which rotary impacts are exerted to the threaded connection until a number of rotary impacts corresponds to the final number or a rotational angle corresponds to the final rotational angle;
• wherein the pattern has a first section with a first gradient and a second section which follows the first section and which has a second gradient, wherein the second gradient is lower than the first gradient.