Welding of galvanized coil

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Kuvapo kwe zinc layer kwaunza zvimwe zvinonetsa pakubatisa simbi yegalvanized.Matambudziko makuru ndeaya: kuwedzera kwekunzwa kwekuputira kuputika uye pores, zinc evaporation uye utsi, oxide slag kuisirwa, uye kunyungudika uye kukuvara kwe zinc coating.Pakati pavo, welding crack, gomba remhepo uye slag kuisirwa ndiwo matambudziko makuru,
Weldability
(1) Mutswe
Munguva yewelding, zinc yakanyungudutswa inoyangarara pamusoro pedziva rakanyungudutswa kana pamudzi weweld.Nekuti nzvimbo yekunyunguduka yezinki yakadzikira zvakanyanya kupfuura iyo yesimbi, simbi iri mudziva rakanyungudutswa inotanga kupenya, uye zinc yewavy ichapinda mairi ichitevedza muganhu wezviyo zvesimbi, zvichikonzera kupera simba kwekubatana kwemagranular.Uyezve, zviri nyore kuumba intermetallic brittle compounds Fe3Zn10 uye FeZn10 pakati pezingi nesimbi, iyo inowedzera kuderedza plastiki yesimbi ye weld, saka zviri nyore kuputika pamwe chete nemuganho wezviyo uye kuumba kuputika pasi pekuita kwekusungirirwa kwekusarira kunetseka.
Zvinhu zvinokanganisa crack sensitivity: ① Hukobvu hwezinc layer: zinc layer yegalvanized steel itete uye crack sensitivity idiki, uku zinc layer yehot-dip galvanized simbi yakakora uye crack sensitivity yakakura.② Workpiece ukobvu: iyo yakakura kukora, iyo yakakura iyo inodzivirira inodzivirira kushushikana uye kukura kwekunzwa kwekutsemuka.③ Groove gap: gap
Yakakura, yakanyanya crack senitivity.④ Welding nzira: iyo crack senitivity idiki kana manual arc welding inoshandiswa, asi yakakura kana CO2 gasi yakadzivirirwa welding inoshandiswa.
Nzira dzekudzivirira kutsemuka: ① Usati waputira, vhura V-yakaita, Y-yakaita kana X-yakaita groove panzvimbo yewelding yerata rine galvanized, bvisa zinc yekuputira padhuze negoro neoxyacetylene kana jecha kuputika, uye kudzora gaka kuti risaite. ive yakakura kwazvo, kazhinji inenge 1.5mm.② Sarudza welding zvinhu zvine yakaderera Si zvemukati.Welding waya ine yakaderera Si content ichashandiswa gasi shielded welding, uye titanium type uye titanium-calcium type welding rod ichashandiswa pa manual welding.
(2) Stomata
Iyo zinc layer iri padhuze negororo ichave oxidize (fomu ZnO) uye inoputika pasi pechiito chekupisa kwearc, uye inoburitsa utsi chena uye chiutsi, saka zviri nyore kwazvo kukonzera pores mu weld.Iyo yakakura iyo welding ikozvino, iyo yakanyanya kuoma iyo zinc evaporation uye yakakura porosity senitivity.Hazvisi nyore kugadzira ma pores ari epakati azvino renji kana uchishandisa titanium mhando uye titanium-calcium mhando inopenya mitsetse yewelding.Nekudaro, kana cellulose mhando uye yakaderera haidrojeni mhando maelectrodes akashandiswa kukwenenzvera, pores ari nyore kuitika pasi pepasi yazvino uye yakakwirira ikozvino.Mukuwedzera, kona ye electrode inofanira kudzorwa mukati me30 ° ~ 70 ° kusvika kure sezvinobvira.
(3) Zinc evaporation uye utsi
Kana ndiro yesimbi yakanyungudutswa yakasungirirwa nemagetsi arc welding, zinc layer iri padyo nedziva rakanyungudutswa rinoiswa oxidized kuZnO uye rinoputika pasi pekuita kwekupisa kwearc, kuumba huwandu hukuru hwehutsi.Chinhu chikuru cherudzi urwu rweutsi iZnO, iyo ine simba guru rinokurudzira panhengo dzekufema dzevashandi.Nokudaro, matanho akanaka ekufambisa mhepo anofanira kutorwa panguva yekuputika.Pasi pezvakadayiwa zvewelding, huwandu hwehutsi hunogadzirwa newelding netitanium oxide type electrode hushoma, nepo huwandu hwehutsi hunoburitswa newelding ine low hydrogen type electrode yakakura.(4) Oxide kubatanidzwa
Kana iyo welding ikozvino idiki, ZnO yakaumbwa mukupisa nzira haisi nyore kupukunyuka, izvo zviri nyore kukonzera ZnO slag kubatanidzwa.ZnO haina kugadzikana uye nzvimbo yekunyungudika i1800 ℃.Yakakura ZnO inclusions ine mhedzisiro yakaipa kwazvo pane weld plasticity.Kana titanium oxide electrode ikashandiswa, ZnO yakanatswa uye yakagovaniswa zvakaenzana, iyo ine mhedzisiro shoma papurasitiki uye kusimba kwesimba.Kana cellulose mhando kana hydrogen mhando electrode inoshandiswa, ZnO mune weld yakakura uye yakawanda, uye weld performance haina kunaka.


Nguva yekutumira: Feb-03-2023