CHARACTERISTICS:-_ PRESENTED BY SANJEEV RATHORE S.S.E.(PWAY/USFD/DHG 9/16/2018 CHARACTERISTICS:-_ THE PERFORMANCE OF AN ULTRASONIC FLAW DETECTOR,THE FOLLOWING IMPORTANT CHARACTERISTICS ARE STUDIED IN DETAIL IT HAS BEEN DISCUSSED AS PER IS:12666-1988 .TO VERIFY THE SUITABILITY OF EQUIPMENT&PROBES LINEARITY OF TIME BASE(UFD) LINEARITY OF AMPLIFICATION(UFD) DEAD ZONE(UFD) RESOLUTION(UFD) MAXIMUM PENITRATION POWE(UFD) PROBE INDEX(PROBE) PROBE ANGLE.(PROBE) PRESENTED BY SANJEEV RATHORE S.S.E.(PWAY/USFD/DHG

PRESENTED BY SANJEEV RATHORE S.S.E.(PWAY/USFD/DHG 9/16/2018 1.LINEARITY OF TIME BASE THIS INVOLVE THE MEASUREMENT OF SUCCESSIVE BOTTOM ECHOES FROM A TEST BLOCK OF A KNOWN LENGTH ON HORZONTAL SCALE OF CRT.THE DISTANCE BETWEEN TWO SUCCESSIVEE CHOES SHOULD BE CONSTANT. LINEARITY OF TIME BASE DEPENDS ONLY UPON FLAW DETECTOR PROBE USED=0DEGREE MODE=SINGLE CRYSTAL FREQUENCY=2MHZ DIA=20X20 RANGE=100/500 REMARK=FOR RANG 100MM,PROBE USED ,ANY DIA &ANY FRQUENCY CONTINUED…….. …………

PRESENTED BY SANJEEV RATHORE S.S.E.(PWAY/USFD/DHG LINEARITY OF TIME BASE PROCEDURE PLACE THE PROBE ON TEST BLOCK AT PROPER POSITION SET FIRST AND LAST ECHO AT START &LAST OF CRT SCREEN READ THE OTHER INDICATION WITH PARTICULAR APPLY THE FORMULA .amax .100 .8b .amax=maximum deviation=1.1(suppose) B=full scale time base=500mm ALLOWED LIMITS= ANALOGUE=+/--2.0% DIGITAL=+/-- 1.25% A POSITION=FOR 100MM RANGE B POSITION-FOR 500MM RANGE 9/16/2018 PRESENTED BY SANJEEV RATHORE S.S.E.(PWAY/USFD/DHG

2.LINEARITY OF AMPLIFICATION IT DEPENDS UPON THE FREQUENCY,OF PROBE,GAIN,RANGES&TIME BASE PROBE=0 DEGREE,2MHZ,SINGLE CRYSTAL RANGE=250/500 PROBE DIA=20x20 PROCEDURE PLACE THE PROBE AT POSITION “A”(250 RANGE) PLACE PRFOR TIME BASE 250M.M. RANGE OBE AT POSITION “B”(500MM RANGE) SELECT ANY SIGNAL&SET IT TO FSH ON VERTICAL SCALE REJECTION SHALL BE MINIMUM OBSERVE THE HEIGHT OF FOLLOWING ECHO(LET IT BE h-1) 9/16/2018 PRESENTED BY SANJEEV RATHORE S.S.E.(PWAY/USFD/DHG

7.REDUCE THE GAIN TO GET OF 50% OF SELECTED SIGNAL 8.APPLY THE FORMULA PRESENTED BY SANJEEV RATHORE S.S.E.(PWAY/USFD/DHG 9/16/2018 7.REDUCE THE GAIN TO GET OF 50% OF SELECTED SIGNAL 8.APPLY THE FORMULA h1-2h2)X100 h1 ALLOWED LIMIT +5%=ANALOGUE +3%=DIGTAL (SELECT ANY TWO ECHOES& SET 1ST PEAK FSH AND READ 2ND PEAK, IT IS =h1 THEN REDUCE 1ST PEAK AT 50% AFTER READ 2ND PEAK IT IS=h2)

(3)CHECKING OF DEAD ZONE IT IS THE CHARACTERISTIC OF THE PROBE DEAD ZONE IS THE AREA JUST BELOW THE PROBE FROM WHERE SIGNAL DOES NOT REFLECTED BACK IT IS DUE TO INTERFERENCE OF THE SOUND WAVE PROBE=0DEGRE,2MHZ,SINGLE CRYSTAL,20X20DIA RANG=100M.M. PRESENTED BY SANJEEV RATHORE S.S.E.(PWAY/USFD/DHG 9/16/2018

SHOW FIGURE :DEAD ZONE OBSERVE THE REFLECTEDSIGNAL FROM POSITION”A”&”B” FOR SINGAL CRYSTAL;DEAD ZONE=6-7M.M.&FOR DOUBLE CRYSTALPROBE DEAD ZONE=2-3M.M. USED STEP GAUGE PRESENTED BY SANJEEV RATHORE S.S.E.(PWAY/USFD/DHG 9/16/2018

4.RESOLVING POWER IT DEPENDS UPON BOTH THE PROBE&FLAW DETECTOR PRESENTED BY SANJEEV RATHORE S.S.E.(PWAY/USFD/DHG 9/16/2018 4.RESOLVING POWER IT DEPENDS UPON BOTH THE PROBE&FLAW DETECTOR IT DETERMINES THE CAPABILITY OF THE EQUIPMENT TO IDENTIFY TWO NEAR BY FLAWS PROBE=0DEGREE,SINGLE CRYSTAL,20X20 DIA PROBE RANGE=100M.M. SET THE PROBE TO ADJUST TWO SUCCESSIVE ECHOES OF SAME HEIGHT INCREASE THE GAIN(MORE THAN 50% HEIGHT SHOUID NOT BE JOINED &SEPERATED AT LEAST 6db TWO ECHO APPEARS ON 85&91 M.M. ON HORIZONTAL SCALE

PRESENTED BY SANJEEV RATHORE S.S.E.(PWAY/USFD/DHG 9/16/2018 RESOLUTION

5.MAXIMUM PENETRATION POWER PRESENTED BY SANJEEV RATHORE S.S.E.(PWAY/USFD/DHG 9/16/2018 5.MAXIMUM PENETRATION POWER IT IS THE ACCESSIBILITY OF SOUND TO PENETRATE INTO THE MAYERIAL IT IS DEPENDS UPON THE INSTRUMENTS& PROBE PROBE=0DEGREE,2MHZ,SINGLE CRYSTAL,20X20 DIA RANG =500M.M. PLACE THE PROBE ON PERSPEXOF TEST BLOCK APPLY THE MAXIMUM GAIN & REJECTION MINIMUM APPEARS FIVE FULL ECHOES& SIXTH ECHOES MAY APPEAR

FIG:PENETRATION POWER 9/16/2018 PRESENTED BY SANJEEV RATHORE S.S.E.(PWAY/USFD/DHG

PRESENTED BY SANJEEV RATHORE S.S.E.(PWAY/USFD/DHG 9/16/2018 6.PROBE-INDEX IT IS THE MARKING ON THE PROBE FROM WHERE CENTRAL BEAM EMERGES OUT IT IS THE POINT FROM WHERE ANGLE OF BEAM NCAN BE DETERMINED PROBE =ANY PROBE RANGE= ANY RANGE THE PROBE IS KEPT ON THE BLOCK AS SHOWN FIG. THE BEAM PATH SHALL BE TOWARDS THE CURVED SURFACE OF THE BLOCK MOVE THE PROBE TILL MAXIMUMHEIGHT OF THE ECHO IS ACHIEVED OBSERVE THE INDEX MARKINGWITH MARKING ON TEST BLOCK(SET BEAM PATH=100M.M. FOR ANY PROBE)

FIG: PROBE INDEX PERMITTED RANGE=+1M.M. 9/16/2018 PRESENTED BY SANJEEV RATHORE S.S.E.(PWAY/USFD/DHG

7.PROBE ANGLE PERMITTED RANGE=+1DEGREE PRESENTED BY SANJEEV RATHORE S.S.E.(PWAY/USFD/DHG 9/16/2018 7.PROBE ANGLE THE BEAM ANGLE DEPENDS UPON THE PROBE IT IS THE ANGLE WHICH THE SOUND WAVE TRANSMITTING INTO THE MATERIAL. PROBE=ANY PROBE RANG =ANY RANG PUT PROBE AT ANGLE MARKED IN IIW BLOCK SET PEAK AT MAX. READ ANGLE DIFFERENCE ANGLE DIFF.&LOCATION ERROR +0.5DEGREE=+3.1M.. +1.0DEGREE=+6.1M.M. +2.0DEGREE=+12.3M.M. PERMITTED RANGE=+1DEGREE

PRESENTED BY SANJEEV RATHORE S.S.E.(PWAY/USFD/DHG FIG:PROBE ANGLE 9/16/2018 PRESENTED BY SANJEEV RATHORE S.S.E.(PWAY/USFD/DHG

CHARACTERISTICS PROBE ANGLE PROBE INDEX LIMIT=+\-1M.M. PRESENTED BY SANJEEV RATHORE S.S.E.(PWAY/USFD/DHG 9/16/2018 CHARACTERISTICS LINEARITY OF TIMEBASE (FORMULA=amax.100 .8b Limit=+\-1.25% LINEARITY OF AMPLIFICATION Formula =(h1-h2).100 h1 Limit=+\-3% CHECKING OF DEAD ZONE S\L PROBE=7M.M. D\CPROBE=3M.M. RESOLUTION POWER D1=85M.M. D2=91M.M. PENETRATION POWERF FIVE FULL ECHOES&SIXTH APEARING ON 23M.M. PERPEX PROBE INDEX LIMIT=+\-1M.M. PROBE ANGLE LIMIT=+\-1DEGREE

AASHUM ASHUM RATHORE ANUSHA SANJEEV PRERNA9/16/2018 PRESENTED BY SANJEEV RATHORE S.S.E.(PWAY/USFD/DHG 9/16/2018 AASHUM ASHUM RATHORE ANUSHA SANJEEV PRERNA9/16/2018