Me yasa matattarar bakin karfe masu wucewa ta hanyar amfani da FCAW sukan kasa yin bincike akai-akai?David Meyer da Rob Koltz sun yi nazari sosai kan dalilan gazawar.Getty Images
Q: Muna gyara welded karfe scrapers a cikin wani bushewa tsarin a cikin wani rigar muhalli.Our welds kasa dubawa saboda porosity, undercuts da fashe welds.Weld A514 zuwa A36 ta yin amfani da 0.045 ″ diamita, duk matsayi, cored 309L, 75% Argon / 25% iskar Carbon Dioxide juriya.
Mun gwada carbon karfe electrodes, amma welds sun yi sauri da sauri kuma mun sami bakin karfe don yin aiki mafi kyau.All welds ana yin su a cikin wani wuri mai laushi kuma suna da tsayi 3/8. Saboda ƙayyadaddun lokaci, duk welds da aka yi a lokaci daya. Menene zai iya sa mu welds kasa?
Ƙarƙashin shinge yawanci yana faruwa ne saboda ƙayyadaddun sigogi na walda, dabarar walƙiya mara kyau, ko duka biyu. Ba za mu iya yin sharhi game da sigogin walda ba saboda ba mu san su ba. Yankewar da ke faruwa a 1F yawanci yana haifar da matsanancin aikin kududdufin walda ko sauri ko saurin tafiya.
Tun da welder yana ƙoƙarin sakawa 3 / 8 ". Yiwuwar overhandling tocilan na iya zama wani ɓangare na alhakin waldawar fillet guda ɗaya tare da ƙaramin diamita mai jujjuyawar waya. Duk da haka, yana bayyana yana amfani da kayan aiki mara kyau a wurin aiki maimakon batun fasaha, wanda shine dalilin da ya sa.
Rashin lalacewa yana faruwa ne ta hanyar ƙazanta a cikin walda, asara ko wuce haddi na iskar kariya, ko yawan shayar da danshi na waya mai raɗaɗi.Kana ambata cewa wannan aikin gyara ne a kan jikakken kafofin watsa labarai a cikin na'urar bushewa, don haka idan ba a tsaftace walda da kyau ba, wannan zai iya zama babban dalilin rashin ruwa.
The filler karfe da kake amfani da shi ne duk matsayi flux cored waya, wadannan wayoyi iri suna da sauri daskarewa slag tsarin.Wannan wajibi ne don tallafa wa kududdufin weld lokacin waldi a tsaye sama ko sama.The hasarar da sauri daskarewa slag shi ne cewa ya solidifies a gaban weld pool a kasa da shi.If da iskar gas har yanzu ana saki, suka yawanci zama tarko da kuma bayyana a cikin wani nau'i na waƙa a cikin wani nau'i na ma'auni a cikin wani nau'i na ma'auni. ƙananan waya mai diamita da ƙoƙarin saka babban weld a cikin fasfo ɗaya, kamar a cikin aikace-aikacenku.
Weld fatattaka a farkon da kuma dakatar da weld za a iya lalacewa ta hanyar da dama dalilai.Tun da kake kwanciya da wani babban dutsen dutse tare da karamin diamita waya, za ka iya fuskanci rashin isasshen Fusion (LOF) a tushen weld.Weld fatattaka ne na kowa sabon abu saboda da high saura weld danniya da LOF a tushen.
Don wannan girman waya, ya kamata ku yi amfani da wucewa biyu ko uku don kammala 3/8 na inch. Fillet welds, babu kowa. Kuna iya samun shi da sauri don yin waldi marar lahani fiye da yin walda mara lahani guda ɗaya sannan sai a gyara shi.
Duk da haka, wani batu da zai iya taka rawar gani a walda fatattaka shi ne ba daidai ba matakin ferrite a cikin weld, wanda shi ne sau da yawa dalilin farko na cracking.309L waya aka ɓullo da don walda bakin karfe zuwa carbon karfe maimakon carbon karfe zuwa carbon steel.The takamaiman weld chemistry na wannan samfurin kuma daukan la'akari da wasu iyaye karfe dilution ga iyaye biyu karafa, da sauran bakin karfe aikace-aikace, da sauran bakin karfe aikace-aikace. samar da adadin da aka yarda da ferrite.Yin amfani da ƙarfe mai cike da kusan 50% ferrite, kamar 312 ko 2209, zai kawar da yiwuwar fashe saboda ƙarancin abun ciki na ferrite.
Hanya mafi kyau don samar da kyakkyawan juriya na lalacewa shine walda haɗin gwiwa tare da daidaitaccen carbon ko bakin karfe na lantarki sannan kuma ƙara wani nau'i na lantarki mai hawan igiyar ruwa.Duk da haka, kun ambaci cewa kun kasance a cikin ƙayyadaddun lokaci mai mahimmanci kuma duk wani yanayin waldawa da yawa ya fita daga cikin tambaya.
Gwada juyawa zuwa waya mai girma diamita, irin su 1/16 inch ko mafi girma. Yin amfani da wayar da aka yi da gas-garre mai jujjuyawar waya yana da kyau saboda yana samar da tsaftacewar weld mafi kyau da kuma kariya mai kyau na iska fiye da waya maras kyau. Duk da haka, maimakon waya mai mahimmanci, kawai layi mai layi da kwancen matsayi na iya rage girman porosity ko tsutsa mai tsutsa. Ya kamata ka kuma canza 302 karfe 302.
WELDER, wanda a da yake Aiki na Welding A Yau, yana nuna ainihin mutanen da suke yin samfuran da muke amfani da su kuma suke aiki da su kowace rana.Wannan mujallar ta yi hidima ga al'ummar walda a Arewacin Amirka sama da shekaru 20.
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