Welding, Spot
The user of this data is assumed to have a manufacturing background with the need to know all of the details of this model.
This model is a manual process whereby the operator moves the part to each spot under the Electrodes of the Spot Welder.
Spot welding is a type of resistance welding used to weld various sheet metal products. The process uses two shaped copper alloy electrodes to concentrate welding current into a small "spot" and to simultaneously clamp the sheets together.
Forcing a large current through the spot will melt the metal and form the weld. The attractive feature of spot welding is a lot of energy can be delivered to the spot in a very short time (ten to one hundred milliseconds. That permits the welding to occur without excessive heating to the rest of the sheet.
The amount of heat (energy) delivered to the spot is determined by the resistance between the electrodes and the amplitude and duration of the current. The amount of energy is chosen to match the sheet's material properties, its thickness, and type of electrodes. Applying too little energy won't melt the metal or will make a poor weld. Applying too much energy will melt too much metal and make a hole rather than a weld.
The technical data for the weld cycle time came from: www.robot-welding.com/Welding_parameters.htm
The speed for the Man is user set/changeable.
User Input
1. Select "Gage Number"
The thickness of the sheet metal is called its gage. The gage of sheet metal ranges from 36 gage to 3 gage. The higher the gage, the thinner the metal is. If you don't know the gage number, select 16 (.0598) from the list for now. The actual decimal size will appear on the next line. You can then go back and reselect until the decimal size you want appears on the screen.
2. "Material Thickness" will appear.
3. The "Weld Time Cycle" per spot is calculated.
4. The "Hold Time Cycle" is calculated per spot.
5. The "Weld Time" and the "Hold Time" is calculated.
6. Enter the "Distance between Spots" on the part.
7. Enter "Number of Spots"
The final "Time per Piece" is the total time it takes to Spot Weld the Part. You may modify the data shown in the "White" blocks on the screen.
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