US 4,223,824 A · Method of multi-bead welding of two workpieces and apparatus for carrying out the method

Abstract

An apparatus for multi-bead welding of two rotating workpieces comprises a flat filler wire holder which can be introduced into the gap between the workpieces and which is periodically pivoted forth and back at substantially constant angular velocity between the two sides of the gap. The pivoting is effected by a motor which is started when a cam rotating in synchronism with the workpieces actuates a stationary signal generator. The cam is provided on a cam disc which is driven through a friction coupling and which, on each revolution, is arrested by a pawl during a period determined by an adjustable timer. The timer is started when the cam actuates a stationary signal generator mounted shortly in advance of the pawl, and after the expiry of the period of the timer the pawl is retracted so that the rotation of the cam disc can continue. The pawl is again advanced to operative position when the cam actuates the first mentioned signal generator.

Claims10

Dependent claims

A method of multi-bead welding of two workpieces, comprising:

supporting said workpieces for rotation about a common center line and such that a gap is defined between substantially parallel opposed end faces of said workpieces,
causing said workpieces to rotate in unison about said common center line,
introducing a holder for a filler wire into said gap,
mechanically advancing a filler wire through said holder into said gap,
periodically pivoting said holder together with said filler wire forth and back between one and the other side of said gap at a substantially constant angular velocity,
after each pivoting movement maintaining said holder stationary in its end position as reached thereby, during a period in which said workpieces rotate substantially 360.degree.,
and after the expiry of each said period generating a signal for initiating a pivoting movement of said holder to its opposite end position.

4 more elements

Apparatus for effecting a multi-bead welding of two workpieces, comprising:

means supporting said workpieces for rotation about a common center line and such that a gap is defined between substantially parallel opposed end faces of said workpieces,
means for rotating said workpieces in unison about said common center line,
a holder for a filler wire and means for mechanically advancing a filler wire through said holder towards a welding position within said gap,
means supporting said holder for pivoting about an axis transverse to said common center line,
a drive motor operatively connected to said holder for pivoting it forth and back about said transverse axis through a predetermined angle and at substantially constant angular velocity,
an actuator connected to said workpieces through a friction coupling for rotation therewith and adapted to generate a starting signal to said drive motor at a predetermined angular position of said actuator,
a stop member and drive means for shifting said stop member between an operative position in which it prevents the rotation of said actuator, and an inoperative position in which the actuator is free to rotate,
and control means operatively connected to said stop member for causing it to stop rotation of said actuator each time the actuator has completed one full revolution and to subsequently release the rotation of the actuator after the expiry of a period of substantially constant duration.

5 more elements

Dependencies are inferred from the claim text.

Method of multi-bead welding of two workpieces and apparatus for carrying out the method

Life of this patent

Method of multi-bead welding of two workpieces and apparatus for carrying out the method

Life of this patent

Abstract

Claims10