Simba remagetsi anogadziriswa e-annular spot laser pakuumbwa uye hunhu hwemakanika hwemakomputa e-intermetallic musimbi yealuminium laser welded lap joints

Pakubatanidza simbi nearuminiyamu, maitiro ari pakati pemaatomu eFe neAl panguva yekubatanidza anoumba brittle intermetallic compounds (IMCs). Kuvapo kweIMC idzi kunoderedza simba remuchina wekubatanidza, saka zvakakosha kudzora huwandu hwemakemikari aya. Chikonzero chekuumbwa kweIMCs ndechekuti kunyungudika kweFe muAl hakuna kunaka. Kana ikapfuura huwandu hwakati, inogona kukanganisa hunhu hwemuchina we weld. IMCs dzine hunhu hwakasiyana hwakadai sekuoma, ductility shoma uye kuoma, uye morphological features. Tsvagiridzo yakawana kuti kana ichienzaniswa nedzimwe IMCs, Fe2Al5 IMC layer inoonekwa seyakanyanya kuputsika (11.8).± 1.8 GPa) IMC phase, uye ndiyo zvakare chikonzero chikuru chekudzikira kwehunhu hwemakanika nekuda kwekutadza kwewelding. Pepa iri rinoongorora maitiro ekucheka kwelaser ari kure eIF steel ne1050 aluminum uchishandisa adjustable ring mode laser, uye rinoongorora zvakadzama pesvedzero yechimiro chelaser beam pakuumbwa kwe intermetallic compounds uye hunhu hwemakanika. Nekugadzirisa core/ring power ratio, zvakaonekwa kuti pasi pe conduction mode, core/ring power ratio ye0.2 inogona kuita zviri nani weld interface bonding surface area uye kuderedza zvakanyanya ukobvu hweFe2Al5 IMC, nokudaro ichivandudza shear strength yejointi.

Chinyorwa chino chinopa simba re adjustable ring mode laser pakuumbwa kwe intermetallic compounds uye hunhu hwe mechanical panguva ye remote laser welding yeIF steel ne 1050 aluminum. Zvakabuda muongororo zvinoratidza kuti pasi pe conduction mode, core/ring power ratio ye 0.2 inopa weld interface bonding surface area yakakura, iyo inoratidzwa ne maximum shear strength ye 97.6 N/mm2 (joint efficiency ye 71%). Pamusoro pezvo, zvichienzaniswa neGaussian beams ine power ratio inopfuura 1, izvi zvinoderedza zvakanyanya ukobvu hweFe2Al5 intermetallic compound (IMC) ne 62% uye total IMC thickness ne 40%. Mu perforation mode, cracks uye shear strength yakaderera zvakaonekwa zvichienzaniswa ne conduction mode. Zvakakosha kuziva kuti grain finance yakakosha yakaonekwa mu weld seam apo core/ring power ratio yaive 0.5.

Kana r=0, simba re loop chete ndiro rinogadzirwa, nepo r=1, simba repakati chete ndiro rinogadzirwa.

Dhiyagiramu yechirongwa chesimba rehuwandu r pakati pedanda reGaussian nedanda reannular

(a) Mudziyo wekunamira; (b) Kudzika nehupamhi hweprofile yekunamira; (c) Dhiyagiramu yemuenzaniso inoratidza marongero emuenzaniso uye ezvishandiso

Kuedzwa kweMC: Kana iri Gaussian beam chete, weld seam inotanga iri mu shallow conduction mode (ID 1 na 2), uye yozochinja kuenda ku particular inopinda lockhole mode (ID 3-5), nekutsemuka kuri pachena. Kana ring power yakawedzera kubva pa 0 kusvika pa 1000 W, pakanga pasina cracks dziri pachena paID 7 uye kudzika kwesimbi kwaive kudiki. Kana ring power yawedzera kusvika pa 2000 na 2500 W (IDs 9 na 10), kudzika kwe rich iron zone kunowedzera. Kutsemuka kwakanyanya pa 2500w ring power (ID 10).

Bvunzo reMR: Kana simba repakati riri pakati pe500 ne1000 W (ID 11 ne12), musono we weld uri mu conduction mode; Kuenzanisa ID 12 neID 7, kunyangwe simba rese (6000w) rakafanana, ID 7 inoshandisa lock hole mode. Izvi zvinokonzerwa nekuderera kukuru kwesimba remagetsi paID 12 nekuda kwedominant loop characteristic (r=0.2). Kana simba rese rasvika 7500 W (ID 15), full penetration mode inogona kuwanikwa, uye zvichienzaniswa ne6000 W inoshandiswa muID 7, simba re full penetration mode rinowedzerwa zvakanyanya.

Kuedzwa kweIC: Modhi yakagadzirwa (ID 16 na17) yakawanikwa pa1500w core power uye 3000w uye 3500w ring power. Kana simba re core riri 3000w uye simba re ring riri pakati pe1500w ne2500w (ID 19-20), mitswe yakajeka inoonekwa panosangana simbi yakapfuma nearuminiyamu yakapfuma, zvichiita patani diki inopinza yemuno. Kana simba re ring riri 3000 ne3500w (ID 21 na22), tsvaga modhi yekupinda keyhole yakazara.

Mifananidzo inomiririra yechiratidzo chega chega chekushongedza welding pasi pemakroskopu ekuona

Mufananidzo 4. (a) Hukama huripo pakati pesimba rekupedzisira rekudhonza (UTS) uye chiyero chesimba mukuyedza kwewelding; (b) Simba rese rekuyedza kwewelding kwese

Mufananidzo 5. (a) Hukama huripo pakati peaspect ratio neUTS; (b) Hukama huripo pakati pekuwedzera uye kudzika kwekupinda uye UTS; (c) Kuwanda kwesimba rekuyedza kwese kwewelding

Mufananidzo 6. (ac) Mepu yeVickers microhardness indentation contour; (df) SEM-EDS chemical spectra inoenderana neyekushongedza modhi yekufambisa; (g) Dhiyagiramu yeSchematic yekubatana pakati pesimbi nearuminiyamu; (h) Fe2Al5 uye ukobvu hwese hweIMC hwemawelds ekufambisa modhi yekufambisa

Mufananidzo 7. (ac) Mepu yeVickers microhardness indentation contour; (df) Semi-EDS chemical spectrum inoenderana yekubatanidza nzira yekupinza pengo renzvimbo

Mufananidzo 8. (ac) Mepu yeVickers microhardness indentation contour; (df) Semi-EDS chemical spectrum inoenderana yekubatanidza nzira yekupinza maburi yakazara

Mufananidzo 9. Plot yeEBSD inoratidza saizi yetsanga yenzvimbo ine iron yakawanda (plate yepamusoro) mukuyedza kwekupinda kwepeturu kwakazara, uye inoyera kugoverwa kwehukuru hwetsanga.

Mufananidzo 10. SEM-EDS spectra yekubatana pakati pesimbi yakapfuma nearuminiyamu yakapfuma

Chidzidzo ichi chakaongorora mhedzisiro yelaser yeARM pakuumbwa, chimiro chidiki, uye hunhu hwemakanika hweIMC mumajoini eIF steel-1050 aluminum alloy dissimilar lap welded. Chidzidzo ichi chakaongorora nzira nhatu dzewelding (conduction mode, local penetration mode, uye full penetration mode) uye matatu akasarudzwa laser beam shapes (Gaussian beam, annular beam, uye Gaussian annular beam). Mhedzisiro yekutsvagisa inoratidza kuti kusarudza chiyero chakakodzera chesimba reGaussian beam neannular beam chinhu chakakosha pakudzora kuumbwa uye microstructure yemukati memodal carbon, nokudaro zvichiwedzera hunhu hwemakanika hweweld. Mu conduction mode, denderedzwa beam rine power ratio ye0.2 rinopa simba rakanakisa rewelding (71% joint efficiency). Mu perforation mode, Gaussian beam inogadzira welding depth yakakura uye higher aspect ratio, asi welding intensity inoderedzwa zvakanyanya. Annular beam ine power ratio ye0.5 ine simba guru pakunatswa kwesimbi side grains mu weld seam. Izvi zvinokonzerwa nekudzikira kwekupisa kwepamusoro pemvura ye annular beam zvichiita kuti kutonhora kuwedzere nekukurumidza, uye kudzikamiswa kwekukura kweAl solute migration kuenda kuchikamu chepamusoro che weld seam pachimiro che grain. Pane hukama hwakasimba pakati peVickers microhardness nekufanotaura kweThermo Calc kwechikamu che phase volume. Kana chikamu che volume cheFe4Al13 chikakura, microhardness inowedzerawo.