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	WELD FORCE DIFFERENTIAL PRESSURE TRANSDUCER (Model WDP)


MEASURE WELDING FORCE

1/4” NPT FITTINGS

	FITS ALL WELD CYLINDERS

RUGGED PACKAGING

		The weld quality of resistance spot welding depends on controlling your weld force. To reduce flash and ensure the proper nugget formation, it is critical that a minimum force ( or pressure) is reached before current is firred and a maximum force is not exceeded during the weld. To minimize weld cycle time, weld as soon as the correct force is reached and eliminate wasted sqeeze cycles.

Retrofit your existing robot transguns, press welders or space critical custom weld machines with a system that allows you to calibrate an accurate initial force level and monitor weld-tip force during every weld. The Model WDP differential pressure transducer is easily mounted between the upper and lower pressure ports of your air cylinder and interfaced with a WN9000 WeldMeter. Once installed, calibrate the system to read pounds of weld tip force using a WP9000 WeldProbe Force Calibrator.

Use the system to set the pressure reulator to provide and acceptable weld force. Then, preset a force limit to a value approximately 5% lower than this force and connect the relay output of the WeldMeter to your PLC or weld controller. The system will now monitor every weld and fire current precisely when the correct force is reached.

During the weld, it is important that the pressure does not continue to increase resulting in a cold weld or small nugget. Use the second programmable limit to detect high pressure and signal the operator when the tip force exceeds your acceptable limit.


	SPECIFICATIONS

Capacity	0-100, 200, 500 psid
Nominal Output Sensitivity	10 mv/v
Excitation Voltage	10 VDC
Excitation Connection	Bendix PTIH-106P or equivalent
Overall Accuracy	0.5% of full scale
Overload Limit	150% of full scale
Operating Temperature Range	-40 to 225^o F.
Compensated Temperature Range	40 to 140^o F.
Pressure Ports	Two, 1/4-18 NPT Male
Housing	Stainless Steel-All welded construction


	HOW TO ORDER

Model
Order Code	AW813
Capacity
100 psid	BR
200 psid	CL
500 psid	CR


	Optional Cable Assembly 15’ Cable with mating Bendix Connector AW993


		DIMENSIONS



	INSTRUMENTATION

The WDP Differential Pressure Transducer is interfaced with a variety of instruments to help monitor and control weld force. The family of WeldMeters range from a simple, single channel instrument with dual limits, relay contacts and analog outputs to single and multi channel microprocessor meters with digital inputs and outputs for multiple head applications.

In all configurations, WeldMeters connect easily to the WDP Pressure Transducer and are calibrated on the machine with a WP9000 WeldProbe Force Calibrator. This provides and output of actual tip force, automatically accounting for cylinder diameter.

Once calibrated, the WeldMeter is easilly programmed to set one or more force limits. One limit is used to trigger current firing after the preset achieved contact force is reached for every weld. This assures the minimum force is reached and minimizes the traditional squeeze time creating shorter weld cycles. Another limit is used to detect if a maximum preset force is exceeded during the weld which may lead to cold welds or ncomplete nugget formation.

Finally, RS232 or 485 serial outputs can provide data logging or peak forces achieved during every weld. The data can provide traceability for quality records or detect trends in force changes.


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