Manyan Batutuwa Tara A Cikin Bakin Karfe Welding

1. Menene bakin karfe da acid resistant bakin karfe?

Amsa: Abubuwan da ke cikin babban nau'in "chromium" a cikin kayan ƙarfe (tare da ƙari na wasu abubuwa kamar nickel da molybdenum) na iya yin karfe a cikin yanayin da ba a so ba kuma yana da halayen bakin ciki. Karfe mai juriya na Acid yana nufin karfen da ke da juriya ga lalata a cikin manyan hanyoyin lalata kamar su acid, alkali, da gishiri.

2. Menene austenitic bakin karfe? Wadanne maki ake amfani dasu?

Amsa: Bakin karfe Austenitic shine mafi yawan amfani da shi kuma yana da mafi girma iri-iri. Misali:

18-8 jerin: 0Cr19Ni9 (304) 0Cr18Ni8 (308)
18-12 jerin: 00Cr18Ni12Mo2Ti (316L)
25-13 jerin: 0Cr25Ni13 (309)
25-20 jerin: 0Cr25Ni20, da dai sauransu

3. Me yasa akwai wani matakin ƙwarewar fasaha a cikin walda bakin karfe?

Amsa: Babban wahalar tsari shine:
1) Bakin karfe abu yana da karfi thermal ji na ƙwarai, tare da dan kadan tsawon zama lokaci a cikin zafin jiki kewayon 450-850 ℃, sakamakon da wani gagarumin raguwa a cikin lalata juriya na welds da zafi shafi yankunan.
2) Yana da saurin fashewar thermal.
3) Kariya mara kyau da matsanancin zafi mai zafi.
4) The coefficient na mikakke fadada ne babba, sakamakon gagarumin walda nakasawa.

4. Me ya sa suke da tasiri matakan matakai don walda austenitic bakin karfe?Amsa: Janar tsari matakan hada da:
1) Zaɓi kayan waldawa sosai dangane da sinadarai na kayan tushe.
2) Small halin yanzu, Quick waldi; Ƙananan makamashin layi yana rage shigar da zafi.
3) Bakin ciki diamita waldi waya da lantarki, non lilo, Multi-Layer da Multi pass waldi.
4) tilasta sanyaya na welds da zafi shafi yankunan don rage zama lokaci a 450-850 ℃.
5) TIG waldi kabu baya argon kariya.
6) The weld dinki a lamba tare da m matsakaici ne a karshe welded.
7) Passivation magani na welds da zafi shafi yankunan.

5. Me ya sa ya zama dole a yi amfani da 25-13 jerin waldi waya da lantarki don waldi austenitic bakin karfe, carbon karfe, da low-alloy karfe (dissimilar karfe waldi)?

Amsa: Domin walda dissimilar karfe gidajen abinci a haɗa austenitic bakin karfe da carbon karfe da low-gawa karfe, da ajiya karfe na weld dole ne a yi amfani da 25-13 jerin walda wayoyi (309, 309L) da waldi sanduna (Ao312, Ao307, da dai sauransu). . Idan aka yi amfani da wasu kayan walda na bakin karfe, za a samar da tsarin martensitic akan layin fusion na karfen carbon da ƙananan ƙarfe, wanda zai haifar da fashewar sanyi.

6. Me yasa ake amfani da iskar kariya na 98% Ar + 2% O2 don igiyar walda mara ƙarfi?

Amsa: Lokacin amfani da m bakin karfe waya MIG waldi, idan tsarki argon gas kariya da ake amfani da, da surface tashin hankali na narkakkar pool ne high, da weld samuwar ba shi da kyau, kuma weld siffar ne "hunchback". Ƙara 1-2% oxygen don rage tashin hankalin saman tafkin narkakkar, yana haifar da samuwar walda mai santsi da ƙayatarwa.

7. Me yasa saman m bakin karfe waldi waya MIG weld juya baki?

Amsa: MIG waldi na bakin karfe mai ƙarfi yana da saurin waldawa (30-60cm/min), kuma bututun iskar gas mai kariya ya riga ya gudu zuwa gaban narkakken tafkin. Weld ɗin har yanzu yana cikin yanayin zafi mai zafi mai zafi, iskar oxidized, kuma saman yana haifar da oxides, yana haifar da weld ɗin ya zama baki. Hanyar wucewa ta pickling na iya cire baƙar fata kuma ta dawo da asalin launi na bakin karfe.

8. Me ya sa m bakin karfe waldi waya bukatar pulsed samar da wutar lantarki cimma jet mika mulki da fantsama free waldi?

Amsa: Lokacin amfani da m bakin karfe waya ga MIG waldi, tare da diamita na 1.2 waya, da jet miƙa mulki za a iya kawai a lokacin da na yanzu ≥ 260-280A; Ana ɗaukar ɗigon da ke ƙasa wannan ƙima a matsayin ɗan gajeren zango, tare da fashe mai mahimmanci kuma gabaɗaya ba za a iya amfani da su ba. Ta hanyar amfani da wadataccen wutar lantarki na MIG mai bugun jini tare da bugun jini na yanzu sama da 300A za a iya samun canjin ɗigon bugun jini a ƙarƙashin igiyoyin walda na 80-260A ba tare da walƙiya ba.

9. Me yasa ake amfani da garkuwar iskar gas na CO2 don waya mai walƙiya bakin karfe? Ba ku buƙatar wutar lantarki tare da bugun jini?

Amsa: A halin yanzu, wayoyi masu walƙiya bakin karfe da aka saba amfani da su (kamar 308, 309, da sauransu) suna da dabarar juzu'i da aka ɓullo da ita dangane da halayen ƙarfe na walda wanda aka samar a ƙarƙashin kariya ta iskar gas ta CO2, don haka ba za a iya amfani da su don walda na MAG ko MIG ba. ; Ba za a iya amfani da tushen wutar lantarki ba.