Ngwọta ikuku na-ekpo ọkụ, nke a makwaara dị ka ọgwụgwọ okpomọkụ dehydrogenation, ma ọ bụ ọgwụgwọ okpomọkụ mgbe weld gasịrị.
Ebumnuche nke ọgwụgwọ post-okpomọkụ nke mpaghara weld ozugbo ịgbado ọkụ bụ iji belata ike nke mpaghara weld, ma ọ bụ wepụ ihe ndị na-emerụ ahụ dị ka hydrogen na mpaghara weld. N'akụkụ a, ọgwụgwọ okpomọkụ na-ekpo ọkụ na-ekpo ọkụ na-ekpo ọkụ na-ekpo ọkụ na-enwe otu mmetụta ahụ.
Mgbe ịgbado ọkụ, okpomọkụ na-ebelata ọnụego jụrụ oyi nke weld seam na nkwonkwo welded iji kwalite mgbapụ nke hydrogen ma zere mmụba nke ike.
(1) Mgbe-ekpo ọkụ maka nzube nke imeziwanye arụmọrụ nke nkwonkwo welded na ibelata ike ya nwere ike ịdị irè naanị mgbe mpaghara ịgbado ọkụ ka na-enwe okpomọkụ dị elu mgbe ịgbado ọkụ.
(2) Mgbe ikpo ọkụ iji gbochie obere okpomọkụ cracks bụ tumadi iji kwalite zuru ezu mwepụ nke hydrogen ume na ịgbado ọkụ mpaghara.
Mwepụ nke hydrogen na-adabere na okpomọkụ na oge ijide oge okpomọkụ. Okpomọkụ maka ebumnuche bụ isi nke mkpochapụ hydrogen bụ ogo 200-300, na oge ikpo ọkụ ga-abụ 0,5-1 awa.
Maka welds n'ọnọdụ ndị a, a ga-eme ọgwụgwọ mkpochapụ hydrogen post-thermal ozugbo ịgbado ọkụ (isi 4):
(1) Ọkpụrụkpụ karịrị 32mm, na ihe ọkọlọtọ ike tensile ike σb>540MPa;
(2) Ihe nchara dị ala nke nwere oke karịa 38mm;
(3) The butt weld n'etiti agbakwunyere nozzle na arịa nrụgide;
(4) Ntụle usoro ịgbado ọkụ na-ekpebi na a chọrọ ọgwụgwọ mkpochapụ hydrogen.
A na-egosipụtakarị uru nke okpomọkụ mgbe okpomọkụ gasịrị site na usoro ndị a:
Tp 455.5 [Ceq] p - 111.4
N'ime usoro ahụ, Tp - - okpomọkụ okpomọkụ ℃;
[Ceq] p——Ụkpụrụ nke carbon.
[Ceq]p=C+0.2033Mn+0.0473Cr+0.1228Mo+0.0292Ni+0.0359Cu+0.0792Si－1.595P+1.692S+0.844V
Iji belata ọdịnaya hydrogen na mpaghara weld bụ otu n'ime mmetụta dị mkpa nke ọgwụgwọ okpomọkụ gasịrị. Dị ka akụkọ si kwuo, na 298K, usoro nke mgbasa ozi hydrogen site na obere carbon steel welds bụ 1.5 ruo 2 ọnwa.
Mgbe okpomọkụ na-abawanye ruo 320K, usoro a nwere ike dị mkpirikpi ka ọ bụrụ 2 ruo 3 ụbọchị na ehihie na abalị, na mgbe ikpo ọkụ na 470K, ọ na-ewe 10 ruo 15 awa.
Isi ọrụ nke ọgwụgwọ post-okpomọkụ na dehydrogenation bụ igbochi nguzobe oyi na-atụ na weld metal ma ọ bụ na mpaghara okpomọkụ na-emetụta.
Mgbe preheating nke weldment tupu ịgbado ọkụ adịghị ezu iji gbochie nguzobe nke oyi na-atụ, dị ka na ịgbado ọkụ nke njikọ dị elu na nchara siri ike na-weld, a ga-eji usoro ikpo ọkụ na-ekpo ọkụ na-eme ka a ghara ịdabere na ya. nke oyi mgbawa.
Oge nzipu: Mar-29-2023
