| 摘要 |
A stud welding apparatus comprising a power supply including power electronics operable for supplying a variable welding voltage together with one of a pilot current and a welding current that is much larger than the pilot current; and a current measuring circuit operable for measuring the electrical current to the weld head; and an input circuit electrically connected between the power electronics and the power supply output, the input circuit including a first inductance, a first resistance, and a switch operable to bridge the first inductance and the first resistance; and a welding circuit electrically connected between the power supply output and the weld stud, the welding circuit having a welding circuit resistance and a welding circuit inductance, and the welding circuit inductance is much smaller than the first inductance of the input circuit; and a voltage measuring device is operable for measuring a voltage across the welding circuit. |
| 主权项 |
1. A stud welding apparatus for drawn arc welding of a stud to a work piece, the stud welding apparatus including:
a welding head assembly including a stud holder for holding the weld stud, the welding head assembly movable between a first position, wherein the weld stud is out of contact with the work piece, and a second position, wherein the weld stud contacts the work piece; a power supply including a power electronics operable for supplying a variable welding voltage to a power supply output, and the power electronics is operable to produce an electrical current (I) including one of a pilot current (IP) and a welding current (IS), and the welding current is much larger than the pilot current; a current measuring circuit electrically connected between the power electronics and the power supply output, the measuring circuit operable for measuring the electrical current (I) to the welding head assembly; an input circuit electrically connected between the power electronics and the power supply output, the input circuit including a first inductance, a first resistance, and a switch operable to bridge the first inductance and the first resistance; a welding circuit electrically connected between the power supply output and the weld stud, the welding circuit having a welding circuit resistance and a welding circuit inductance, and the welding circuit inductance is much smaller than the first inductance of the input circuit; and a voltage measuring device operable for measuring a voltage across the welding circuit (USK). |
