Electric heating – Metal heating – By arc
Patent
1986-03-17
1987-03-03
Shaw, Clifford C.
Electric heating
Metal heating
By arc
2191305, 901 42, B23K 912
Patent
active
046477535
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
This invention relates to a welding method in an automatic welding machine and, more particularly, to a welding method well-suited for use in selecting the welding conditions for an automatic welding machine, the motion of which is controlled by a robot.
Welding machines are available in which welding is performed by impressing a voltage across a wire and a workpiece to produce an arc at the tip of the wire, where the wire tip is moving along a welding path while the wire is successively laid out in small increments. FIG. 1 is a simplified view of such a welding machine, in which a wire WR is laid out in small increments in the direction of the arrows from feed rollers FR to protrude from the end of a torch TC via guide member GB. The amount by which the wire WR is fed is controlled in such a manner that the tip of the wire is situated at a position spaced a predetermined distance (e.g., 15 mm) from the surface of the workpiece WK. The plus side of a welding power supply PS for generating an intermittent high voltage having a predetermined period is applied to the wire WR through the guide member GB, and the minus side of the high-voltage power supply is applied to the workpiece WK. Gas from a gas supply unit (gas bombe), which is not shown, is supplied through the interior or the torch TC in the direction of the arrows so as to impinge upon the portion of the workpiece being welded to prevent the oxidation thereof. When a high voltage is generated intermittently by the welding power supply PS while the gas is fed from the gas supply unit and the wire is laid out in small increments, an arc is produced at the tip of the wire and both the wire and the portion being welded are melted to weld the fused portions together.
In a welding machine of this type, welding conditions such as optimum welding voltage, wire feed speed, preflow duration, postflow duration and crater processing duration are decided in dependence upon the wire material and the material of the workpiece portion being welded, welding speed and the like. Accordingly, when conventionally welding, the optimum welding conditions are set on dials or the like and welding is performed based on the set welding conditions. However, since the welding voltage, wire delivery speed, preflow duration, postflow duration and crater processing duration must be set using the dials or the like, drawbacks are encoutered in that setting of the welding conditions is complicated and changing welding conditions cannot be performed in a simple manner. Furthermore, in a case where the welding conditions differ at the start and at the completion of welding, the welding conditions must be set on the dials for each occasion, thereby rendering the operation of setting the welding conditions even more troublesome. Moreover, a large number of dials are required, thereby raising the cost of the welding machine.
SUMMARY OF THE INVENTION
Accordingly, an object of the present invention is to provide a welding method whereby desired welding conditions can be selected without setting welding conditions on dials.
Another object of the present invention is to provide a welding method in an automatic welding machine, wherein welding voltage, wire delivery speed, preflow duration, postflow duration and crater processing duration are treated as one set of welding conditions, a number of sets of these welding conditions are stored in a memory, and welding voltage, wire delivery speed, preflow duration, postflow duration and crater processing duration can be selected merely by specifying the name of the desired welding condition.
Still another object of the present invention is to provide a welding method in an automatic welding machine, which reduces the cost of welding machines because dials are not used.
The present invention provides a welding method for an automatic welding machine in which welding is performed by impressing a voltage across a wire (which is transported along a welding path by a robot), and a workpiece to produce an arc at the tip of
REFERENCES:
patent: 4249062 (1981-02-01), Hozumi et al.
patent: 4390954 (1983-06-01), Manning
patent: 4445022 (1984-04-01), Mori
Nakashima Seiichiro
Torii Nobutoshi
Fanuc Ltd.
Shaw Clifford C.
LandOfFree
Welding method in automatic welding machine does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Welding method in automatic welding machine, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Welding method in automatic welding machine will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1018129