US 2010/0059486 A1 · METHOD OF WELDING PROJECTION BOLT AND WELDING APPARATUS

Abstract

Provided are a welding method and a welding apparatus capable of appropriately starting the advancement of an electrode based on the positioning of a welding point on a steel plate part to which a projection bolt is to be welded and on the state of completion of feeding of the projection bolt to the electrode. A bolt (10) held by a feed rod (17) is inserted into a receiving hole (20) of an electrode (6), and an air blast is applied from a holding head (18) to complete the insertion of the bolt into the receiving hole (20). Then, the feed rod (17) is retracted. Subsequently, the electrode (6) is advanced to weld the bolt to a steel plate part (30) by electric resistance welding. In this case, the electrode (6) is advanced toward the steel plate part (30) in response to a signal generated upon insertion of the bolt and a signal generated after a welding point on the steel plate part (30) is adjusted. Subsequently, pressurization and energization are carried out.

Claims20

Dependent claims

A method of welding a projection bolt, including:

inserting an end portion of a projection bolt held by a holding head of an advancing-retracting feed rod into a receiving hole of an electrode by means of an advancing action of insertion driving means when the feed rod is located at an advanced position;
applying a pushing-out force from the holding head to the projection bolt held at an insertion position to complete insertion of the projection bolt into the receiving hole;
retracting the feed rod;
and then advancing the electrode to weld the projection bolt to a steel plate part on standby by electric resistance welding,
the method characterized by advancing the electrode toward the steel plate part in response to a signal generated upon the insertion of the projection bolt into the receiving hole and a signal generated when a welding point on the steel sheet part to which the projection bolt is to be welded is aligned with the electrode, and then carrying out pressurization and energization.

2 more elements

An apparatus for welding a projection bolt, including:

an electric resistance welding mechanism including a pair of electrodes and advancing pressurizing means for advancing and retracting one or both of the pair of electrodes along an electrode axis line, any one of the pair of electrodes having a receiving hole formed therein, the receiving hole being coaxial with the electrode axis line, the electric resistance welding mechanism for welding a projection bolt inserted into the receiving hole to a steel plate part;
a welding part-feeding mechanism including a feed rod, advancing-retracting means for advancing and retracting the feed rod holding the projection bolt toward and from the electrode axis line, and insertion driving means for inserting the projection bolt held by the feed rod into the receiving hole;
a steel plate part moving mechanism for inserting the steel plate part between the pair of electrodes and moving a welding point for the projection bolt toward the electrodes;
and
a control unit for operating the electric resistance welding mechanism, the welding part-feeding mechanism, and the steel plate part moving mechanism, the apparatus characterized in that the control unit outputs an actuating signal for the advancing pressurizing means in response to at least a signal indicating completion of insertion of the projection bolt into the receiving hole and a signal indicating completion of movement of the steel plate part, and advancement of the electrodes held in a retracted state is started in response to the actuating signal.

2 more elements

Dependencies are inferred from the claim text.

Method of welding projection bolt and welding apparatus

Life of this patent

Method of welding projection bolt and welding apparatus

Life of this patent

Abstract

Claims20