Master Project Presentation: Copper Backing Shoes
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Transcript of Master Project Presentation: Copper Backing Shoes
The damage of copper backing shoes during root pass in GMAW
The damage of copper backing shoes during root pass in GMAWCLANDIA SIM
Internal Line-Up Clamp (ILUC)Root passAvoid misalignmentCopper or ceramic shoes
Copper backing shoesDamage after a degree of usage (number of welds)Replace according to DNV-OS-F101Not a clear statement
Copper InclusionCommon defect listed in DNV-OS-F101Probably associated with Copper Contamination Cracking (CCC)Research on CCC in late 1970s early 1980s 4 conditions that made CCCLiquid and solid metal
Tensile stress Plastic deformationNo intermetallic compoundHigh/Low solubility gradientHigh/Low melting point gradient
Method: Materials Preparation1m19cm
Method: GMAW Welding
Shielding gas: Mixture of 86% Argon, 12% CO2 and 2% OxygenElectrode: AWS A5.18 E70S-6 copper coated steel wire4 welds
Method: Material examinations
Visual inspection CameraOxide formation
Microscope LEICA MZ6Number of pitsSurface area of damage
8
Key Result 1: Oxide formation
Less as increase number of weldsWELD1WELD2WELD3WELD4WELD1WELD2WELD3WELD4
WELD1WELD2WELD3WELD4WELD1WELD2WELD3WELD4WELD1WELD2WELD3WELD4
Key Result 2: No. of pits and damage area vs No. of welds
Key Result 3: No. of pits and damage area vs different level of gaps
Key Result 4: Molten bits formation
Started to form after 4th weldMuch smaller, within the previous mentioned oxide pits
SummaryRepeating weldsNo. pits increase, area of damage increase
Less oxide layer formed
Molten bits started to form after 4th welds
Easier to get copper inclusion
Future WorksContinueUnit pX to mmInput Weld 4 result more effectively ImprovementMass of OxideDepth of the damageResearch questionsCopper inclusion>>CCCSolution for CCC solve for copper inclusionTo DoNumber of weldsFull scale model NDT on steel plate
Thank you for listeningAny questions?