Nima uchun jilolangan payvandlangan barmoqli titaniumli suv isitgichi (stress kontsentratsiyasi omili)<1.2) Outlast an As-Welded Joint (SCF >3) 90 darajali dengiz suvi katodik himoya tizimida 5 faktor bilan?

Korroziya va vodorodning mo'rtlashuvi 90 daraja sho'r suvli katodik himoya tizimida titanium isitgichlarga hujum qiladi. Payvand chokining oyoq barmoqlari mintaqasi sezilarli stress kontsentratsiyasining joyidir. Payvandlangan bo'g'inlar 3-5 kuchlanish kontsentratsiyasi koeffitsienti (SCF)ga ega bo'lganligi sababli, sayqallangan payvand barmoqlari SCF ni pastga tushiradi.<1.2. Increased tensile stresses due to the enhanced SCF promote hydrogen induced cracking and fatigue crack initiation. Polishing reduces SCF and increases service life by 5 times.

Stress kontsentratsiya faktoriga qarshi Miqdoriy charchoq hayoti

2-darajali titanium uchun 90 darajali dengiz suvida katod himoyasi (-0,85 V va Ag/AgCl):

Payvandlangan oyoqning holati SCF sikllarini Crack OnsetLife uchun-Payvandlangan
-payvandlangan, oʻtkir tishli 4-5 10,000-30,000 1 X Payvandlangan, oʻrtacha 3-4 20,000-50,000 1.5 X
Tuproq silliq 1.5-2 50,000-150,000 3x
Jilolangan (mexanik) 80 000-200,000 1.2-1.5 4x
Elektropolizlangan (SCF <1,2)<1.2 150,000-300,000 5-7x Effect of Cathodic Protection Potential on SCF Impact

CP potentsiali (V va Ag/AgCl)Hayot (tsikllar) As-WeldedLife Rate Jilolangan umr (tsikllar) -0.80 100,000–200,000 500,000–1,000,000 5×
-0.85 30,000–60,000 150,000–300,000 5×
-0.90 10,000–20,000 50,000–100,000 5×
-0.95 5000-10000 25000-50000 5× Oyoq barmoqlarini payvandlash boʻyicha qoʻllanma

Xizmatning jiddiyligi|Kerakli payvandlangan oyoq pardasi|SCF maqsadi|Kutilayotgan charchoqning umrini oshirish
Past sikl (<10,000 total)As welded <4 1x
O'rtacha tsikl (10 000 dan 50 000 gacha) Silliq zamin<2 3×
Yuqori sikl (50 000-200 000) Jilolangan 4x<1.5
Very high cycle (>200 000 ) Elektropolizlangan<1.2 5-7x Engineering Recommendation

90 darajali katodli himoyalangan sho'r suvdagi titanli isitgichlar barcha payvand choklari silliq silliqlangan va SCF hosil qilish uchun elektropoliyalangan.<1.2. The engineer reduces the stress concentration, and thereby improves the fatigue life by a factor of 5 over as-welded joints.