?url_ver=Z39.88-2004&rft_id=UNIVERSITAS+LAMPUNG&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Adc&rft.title=PENGARUH+VARIASI+KECEPATAN+PENGELASAN+TUNGSTEN+INERT+GAS+(TIG)+TERHADAP+KEKUATAN+TARIK+HASIL+SAMBUNGAN+LAS+PADA+BAJA+KARBON+RENDAH+(ST+41)&rft.creator=RAHMAT+DANI%2C+1015021047&rft.subject=Mesin+(General).+Mesin+Sipil+(General)&rft.description=Las+TIG+(tungsten+inert+gas)+adalah+proses+pengelasan+menggunakan+panas+dari+nyala+pijar+yang+tebentuk+dari+elektroda+tungsten+dan+gas+mulia+sebagai+gas+pelindung.+Pada+penggunaan+las+TIG%2C+parameter+pengelasan+harus+diperhatikan+seperti+kecepatan+las%2C+besar+arus%2C+jenis+arus+dan+parameter+lainnya.+Karena+parameter+yang+digunakan+sangat+berpengaruh+pada+sifat+mekanik+logam+khususnya+pada+logam+hasil+lasan.+Selain+parameter+tersebut%2C+kecepatan+pengumpan+logam+pengisi+dapat+diatur+terlepas+dari+besarnya+arus+dan+kecepatan+las+yang+digunakan.+Hal+ini+memungkinkan+las+TIG+cocok+digunakan+untuk+plat+baja+tipis+maupun+tebal.+Namun+tidak+semua+logam+baja+mempunyai+sifat+mampu+las+yang+baik.+Baja+karbon+rendah+(kandungan+karbon+%3C+0%2C30+%25)+adalah+jenis+baja+dengan+sifat+mampu+las+yang+baik.+berdasarkan+hasil+pengujian+tarik+yang+dilakukan%2C+diketahui+bahwa+raw+material+mempunyai+kekuatan+tarik+sebesar+460%2C55+MPa.+Nilai+kekuatan+tarik+terbesar+hasil+pengelasan+dengan+kecepatan+las+1+mm%2Fs+yaitu+sebesar+433%2C80+MPa+atau+mengalami+penurunan+sebesar++26%2C75+MPa+(5%2C8+%25).+Nilai+kekuatan+tarik+terkecil+hasil+pengelasan+dengan+kecepatan+las+10+mm%2Fs+yaitu+288%2C86+MPa+atau+mengalami+penurunan+sebesar+171%2C69+MPa+(37%2C2%25).+Dari+pengujian+mikro+yang+dilakukan+diperoleh+fasa+butir+dari+raw+material+yaitu+ferit+dan+perlit.+Pada+daerah+lasan+dan+HAZ%2C+juga+diperoleh+fasa+ferit+dan+perlit.+Namun+pada+daerah+lasan+dan+HAZ+struktur+butir+menjadi+lebih+kasar+dan+lebih+lunak%2C+hal+ini+disebabkan+oleh+pengaruh+panas+yang+terjadi+saat+proses+pengelasan.+Berdasarkan+hasil+yang+diperoleh+dapat+disimpulkan+bahwa+kecepatan+las+berbanding+lurus+dengan+arus+yang+digunakan%2C+dimana+semakin+besar+kecepatan+las+maka+arus+yang+digunakan+juga+semakin+besar.+Hal+ini+terbukti+bahwa+semakin+besar+kecepatan+las+dengan+arus+yang+tetap+maka+nilai+kekuatan+tarik+semakin+menurun.%0D%0A%0D%0AKata+kunci%3A+las+TIG+(tungsten+inert+gas)%2C+Parameter+pengelasan%2C+baja+karbon+rendah%2C+struktur+mikro%0D%0A%0D%0A%0D%0ATIG+(tungsten+inert+gas)+is+the+welding+technique+which+use+heat+energy+formed+by+tungsten+electrode+light+and+noble+gases+as+a+shield.+The+preservation+of+welding+parameters+such+as+welding+speed%2C+huge+current%2C+type+of+currents+and+the+other+parameters+is+important+to+do.+Because+the+using+of+parameters+is+totally+affecting+to+the+characteristics+of+metal+especially+at+the+result+of+welding+metal.+Beside+these+parameters%2C+the+velocity+of+bait+filler+metal+can+be+arranged+either+amount+of+current+and+welding+speed+that+is+used.+It+may+cause+TIG+(tungsten+inert+gas)+is+not+fit+for+thin+or+thick+steel+plate.+But+not+all+of+steel+has+good+welding+characteristic.+Low+carbon+steel+(carbon+%3C0.30%25)+is+the+type+of+steel+with+good+welding+characteristics.+Based+on+the+tensile+strenght+result+we+can+see+that+raw+material+has+tensile+strength+up+to+460.55+MPa.+The+highest+tensile+strength+from+the+welding+result+with+1+mm%2Fs+velocity+is+433.80+MPa+that+approximately+decreasing+to+26.75+MPa+(5.8%25).+The+lowest+tensile+strength+from+the+welding+result+with+10+mm%2Fs+velocity+is+288.86+MPa+that+approximately+decreasing+to+171.69+MPa+(37.2%25).+According+to+the+microstructure+test+resulted+granule+phase+from+the+raw+material+is+ferrite+and+perlite.+At+the+welding+area+and+HAZ+also+resulted+ferrite+phase+and+perlite.+But+in+that+area+and+HAZ+granule+structure+become+rougher+and+softer%2C+this+is+caused+by+the+effect+of+heat+energy+that+occur+during+the+welding+process.+The+conclusion+based+of+the+result+is+the+velocity+directly+proportional+with+the+using+of+current%2C+if+the+velocity+is+higher%2C+so+the+current+also+must+be+higher.+It+is+prove+that+if+welding+speed+is+higher+and+the+current+is+constant+then+the+tensile+strength+is+decrease.+%0D%0A%0D%0AKey+words%3A+TIG+(tungsten+inert+gas)%2C+welding+parameters%2C+low+carbon+steel%2C+and+microstructure.%0D%0A&rft.publisher=FAKULTA+TEKNIK&rft.date=2016-05-04&rft.type=Skripsi&rft.type=NonPeerReviewed&rft.format=text&rft.identifier=http%3A%2F%2Fdigilib.unila.ac.id%2F22365%2F1%2FABSTRAK%2520%2528INDONESIA%2520%2526%2520INGGRIS%2529.pdf&rft.format=text&rft.identifier=http%3A%2F%2Fdigilib.unila.ac.id%2F22365%2F2%2FSKRIPSI%2520FULL.pdf&rft.format=text&rft.identifier=http%3A%2F%2Fdigilib.unila.ac.id%2F22365%2F3%2FSKRIPSI%2520TANPA%2520PEMBAHASAN.pdf&rft.identifier=++RAHMAT+DANI%2C+1015021047++(2016)+PENGARUH+VARIASI+KECEPATAN+PENGELASAN+TUNGSTEN+INERT+GAS+(TIG)+TERHADAP+KEKUATAN+TARIK+HASIL+SAMBUNGAN+LAS+PADA+BAJA+KARBON+RENDAH+(ST+41).++FAKULTA+TEKNIK.+++++&rft.relation=http%3A%2F%2Fdigilib.unila.ac.id%2F22365%2F