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  • INTRODUCTION - American Welding SocietyINTRODUCTION Many engineers are very particular with the storage and care of low hydrogen electrodes when they are to be used especially in critical
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The Care of Low Hydrogen Electrodes and its Impact on Weld Quality Michael J Herkert Illinois Central College, Advisor: Dr. Richard Polanin INTRODUCTION ▪ Many engineers are very particular with the storage and care of low hydrogen electrodes when they are to be used especially in critical parts, due specifically to the greater risk of weld defects. Therefore, the following presentation is designed to show the individual how the exposure of H2O to low hydrogen SMAW electrodes such as the 7018, might weaken or affect the quality of the weld. 3/32” E-7018, 70 amps, DCEP. Welded in the Flat Position. 1/8” Regular Low Carbon Steel Plate with slight bevel for the Butt- Joint. Same SMAW Outfit Used. Welds Air Cooled. Face Bend on Butt-Joint. 3-Pass Tee- Joint inspected cut and cold etched. Sample #1 Electrodes have been properly stored in the drying oven. Sample #2 Electrodes have been exposed to the air in an indoor facility for 3 days. Sample #3 Electrodes have been momentarily submerged in water, and left to air dry for 3 days in an indoor facility. SPECIFICATIONS RESULTS ANALYSIS AND CONCLUSION • None of the face bends performed on the welded Butt-Joints showed any defects, however there were some slight discontinuities or imperfections in samples #2 and #3 with very minor undercut, (Deepest less than .4 mm in depth). • None of the 3-Pass T-Joints etched and inspected showed any defects, however there were some discontinuities found from the visual inspection in the welds of Samples #2 and #3, they both had 5 porosity pores with no more than 2 pores for each five inch weld pass and less than 1 mm in length per a pore. • To conclude, it is shown that there is at least a slight relation between the storage of low hydrogen electrodes and weld quality, due to the test results that show an increase in porosity with the electrodes that were not properly stored. (Sample #1) Face Bend. (Sample #2) Face Bend. (Sample #3) Face Bend. (Sample #1) 3-pass etched. (Sample #2) 3-pass etched. (Sample #3) 3-pass etched.

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Page 1: INTRODUCTION - American Welding SocietyINTRODUCTION Many engineers are very particular with the storage and care of low hydrogen electrodes when they are to be used especially in critical

The Care of Low Hydrogen Electrodes and its Impact on Weld Quality

MichaelJHerkert

IllinoisCentralCollege,

Advisor:Dr.RichardPolanin

INTRODUCTION▪ Manyengineersareveryparticularwiththestorageandcareoflowhydrogenelectrodeswhentheyaretobeusedespeciallyincriticalparts,duespecificallytothegreaterriskofwelddefects.Therefore,thefollowingpresentationisdesignedtoshowtheindividualhowtheexposureofH2OtolowhydrogenSMAWelectrodessuchasthe7018,mightweakenoraffectthequalityoftheweld.

3/32”E-7018,70amps,DCEP.WeldedintheFlatPosition.1/8”RegularLowCarbonSteelPlatewithslightbevelfortheButt-Joint.SameSMAWOutfitUsed.WeldsAirCooled.FaceBendonButt-Joint.3-PassTee-Jointinspectedcutand

coldetched.

Sample#1Electrodeshavebeenproperlystored

inthedryingoven.Sample#2

Electrodeshavebeenexposedtotheairinanindoorfacilityfor3days.

Sample#3Electrodeshavebeen

momentarilysubmergedinwater,andlefttoairdryfor3

daysinanindoorfacility.

SPECIFICATIONS

RESULTS

ANALYSISANDCONCLUSION•  NoneofthefacebendsperformedontheweldedButt-Jointsshowedanydefects,however

thereweresomeslightdiscontinuitiesorimperfectionsinsamples#2and#3withveryminorundercut,(Deepestlessthan.4mmindepth).

•  Noneofthe3-PassT-Jointsetchedandinspectedshowedanydefects,howeverthereweresomediscontinuitiesfoundfromthevisualinspectionintheweldsofSamples#2and#3,theybothhad5porosityporeswithnomorethan2poresforeachfiveinchweldpassandlessthan1mminlengthperapore.

•  Toconclude,itisshownthatthereisatleastaslightrelationbetweenthestorageoflowhydrogenelectrodesandweldquality,duetothetestresultsthatshowanincreaseinporositywiththeelectrodesthatwerenotproperlystored.

(Sample#1)FaceBend. (Sample#2)FaceBend. (Sample#3)FaceBend.

(Sample#1)3-passetched. (Sample#2)3-passetched. (Sample#3)3-passetched.

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