جستجوی مقالات مرتبط با کلیدواژه « E8010 » در نشریات گروه « مواد و متالورژی »

In this study, the cracking sensitivity of deposited weld of E8010-P1 cellulosic electrodes as a function of base metal thickness and interpass temperature was analyzed. For this purpose, different welded samples (different base metal thickness and interpass temperature) were subjected to the bending test according to the SEP-1390 bohler specification. Studies illustrated an increase in the minimum interpass temperature from 80?C to 120?C is required with increasing base metal thickness from 20mm to 30mm to prevent weld cracking. Increasing of interpass temperature not only decreases the welding cooling rate but also reduces the heat sink effect of base metal and therefore decreases the cracking sensitivity. Structural studies indicated that the main cause of E8010-P1 weld metal cracking is development of undesirable phases such as grain boundary and widmanstaten ferrite in the weld metal. In addition, optimum cooling time between 800-500?C (?t8/5) for preventing E8010-P1 weld metal cracking determines to be around 18010s.

Cellulose is a natural biopolymer with the general (C6H10O5)n formula, which according to AWS A5.5 standard, more than 40wt% of coating of cellulosic electrodes is consisted of cellulose. In this study to evaluate the effect of cellulose type on the performance of E8010-P1 cellulosic electrode, equal amounts of two celluloses with the same commercial properties but produced by two different companies, were used for production of two E8010-P1 electrodes.Experimental studies illustrate significant difference between structural and mechanical properties of deposited weld metals from these electrodes. FTIR, DTA and XRD testes of as-received celluloses show despite the same brandforthese celluloses, their properties such as bonds types,thermal behavior and crystallinity are different that cause variation ofweld metal penetrate and tensile strength around 25±2% and 5±2%respectively.