Poukisa yon aparèy chofaj Titàn Immersion ak yon zòtèy poli soude (faktè konsantrasyon estrès<1.2) Outlast an As-Welded Joint (SCF >3) pa yon Faktè 5 nan yon sistèm pwoteksyon katodik dlo lanmè 90 degre?

Kowozyon ak idwojèn frajil atake aparèy chofaj Titàn nan yon sistèm pwoteksyon kathodik dlo sale 90 degre. Rejyon zòtèy soude a se yon kote ki gen konsantrasyon estrès enpòtan. Kòm -jinti soude yo gen yon faktè konsantrasyon estrès (SCF) 3-5, zòtèy soude poli pi ba SCF pou<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.

Estrès Konsantrasyon Faktè vs Kantitatif Fatig Lavi

Pou Klas 2 Titàn nan dlo lanmè 90 degre ak pwoteksyon katodik (-0.85 V vs Ag/AgCl):

Kondisyon zòtèy soude SCF sik nan krak OnsetLife an referans a kòm-soude
Kòm-soude, antay byen file 4-5 10,000-30,000 1 X Kòm-soude, mwayèn 3-4 20,000-50,000 1.5 X
Tè lis 1.5-2 50,000-150,000 3x
Poli (mekanik) 80,000-200,000 1.2-1.5 4x
Electropolished (SCF <1.2)<1.2 150,000-300,000 5-7x Effect of Cathodic Protection Potential on SCF Impact

CP Potansyèl (V vs Ag/AgCl)Lavi (sik) kòm-WeldLife To Polished Life (sik) -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× Gid pou fini soude zòtèy

Severite Sèvis|Obligatwa soude zòtèy fini|SCF Sib|Espere amelyore lavi fatig
sik ki ba (<10,000 total)As welded <4 1x
Sik modere (10,000 a 50,000) Tè lis<2 3×
Segondè sik (50,000-200,000) Poli 4x<1.5
Very high cycle (>200,000) Elektwopolis<1.2 5-7x Engineering Recommendation

Titàn aparèy chofaj nan dlo sale katodik pwoteje nan 90 degre gen tout zòtèy soude tè lis ak electropolished yo pwodwi SCF.<1.2. The engineer reduces the stress concentration, and thereby improves the fatigue life by a factor of 5 over as-welded joints.