Ubale pakati pa kuwotcherera liwiro ndi weld khalidwe

Ubale pakati pa liwiro la kuwotcherera ndi mtundu wa weld uyenera kumveka mwachiyankhulo osati kunyalanyazidwa. Makamaka kuwonetseredwa mu Kutentha siteji ndi crystallization siteji.

Kutenthetsa siteji: Pa chikhalidwe cha mkulu-pafupipafupi msoko welded chitoliro, m'mphepete mwa chitoliro akusowekapo ndi usavutike mtima kuchokera firiji kutentha kuwotcherera. Nthawi imeneyi, m'mphepete mwa chitoliro akusowekapo si kutetezedwa ndi kwathunthu poyera mlengalenga, amene mosalephera amachitira chiwawa ndi mpweya, nayitrogeni, etc. mu mlengalenga, kuchititsa kwambiri kuwonjezeka asafe ndi oxides mu weld msoko. Malinga ndi miyeso, nayitrogeni wopezeka mumsoko wowotcherera amawonjezeka ndi nthawi 20-45, ndipo kuchuluka kwa okosijeni kumawonjezeka nthawi 7-35; Nthawi yomweyo, zinthu zophatikizika monga manganese ndi kaboni zomwe zimapindulitsa ku msoko wowotcherera zimawotchedwa kwambiri ndikuwuka, zomwe zimapangitsa kuchepa kwa mawotchi a weld seam. Kuchokera pa izi, zikhoza kuwoneka kuti m'lingaliro ili, pang'onopang'ono liwiro la kuwotcherera, ndiloipa kwambiri khalidwe la weld seam.

Komanso, kutalika kwa m'mphepete mwa billet yotentha kumawonekera mlengalenga, kuthamanga kwapang'onopang'ono kumapangitsa kuti pakhale ma oxides osakhala achitsulo m'zigawo zakuya. Izi zozama zokhala zopanda zitsulo zotsekemera zimakhala zovuta kufinya kwathunthu mumsoko wowotcherera panthawi yotsatiridwa ndi crystallization yotsatizana, ndikukhalabe mumsoko wowotcherera mu mawonekedwe a inclusions osakhala zitsulo pambuyo pa crystallization, ndikupanga mawonekedwe osalimba omwe amawononga kupitiriza kwa kamangidwe ka weld seam ndi kuchepetsa mphamvu ya weld seam. Ndipo kuthamanga kwa kuwotcherera kumathamanga, nthawi ya okosijeni ndi yaifupi, ndipo ma oxides omwe si zitsulo amapangidwa ndi ang'onoang'ono ndipo amangokhala pamwamba. Ndikosavuta kufinyidwa mumsoko wowotcherera panthawi yowotcherera, ndipo sipadzakhala zotsalira zambiri zopanda zitsulo zotsalira mumsoko wowotcherera, zomwe zimapangitsa kuti pakhale mphamvu zowotcherera.

Gawo la Crystallization: Malinga ndi mfundo zazitsulo, kuti mupeze ma welds amphamvu kwambiri, ndikofunikira kuwongolera kapangidwe kake ka chitsulo momwe mungathere; Njira yoyambira yoyengedwa ndiyo kupanga magalasi okwanira m'kanthawi kochepa, kotero kuti amalumikizana wina ndi mzake asanayambe kukula ndikuthetsa ndondomeko ya crystallization. Izi zimafuna kuwonjezera liwiro kuwotcherera mwamsanga kuchotsa kuwotcherera ku zone Kutentha, kuti athe kuwotcherera crystallize mofulumira pa mlingo wapamwamba wa undercooling; Pamene mlingo wa undercooling ukuwonjezeka, mlingo wa nucleation ukhoza kuwonjezeka kwambiri, pamene kukula kwa kukula kumawonjezeka pang'ono, motero kukwaniritsa cholinga choyenga kukula kwa tirigu wa msoko wa weld. Choncho, kaya kuonedwa kuchokera Kutentha siteji ya kuwotcherera ndondomeko kapena kuzirala pambuyo kuwotcherera, mofulumira kuwotcherera liwiro, ndi bwino khalidwe la weld msoko, malingana kuti zinthu zofunika kuwotcherera akumana.