Protected: Ship IMO type I, II, III (full words)
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Author: Amarine Antonio
Shipbuilding and welding professional.
What is CJP in welding
According to AWS D1.1 requirement (The others like ASME IX, EN ISO 15614. API 1104 doesn’t) CJP (complete joint penetration): A joint root condition in a groove weld in which weld metal extends through the joint thickness. There are two … Continue reading What is CJP in welding
Back gouging in welding
When welding on thick plate or pipe, it is often impossible for the welder to get 100% penetration without some type of groove being used. The groove may be cut into just one of the plates or pipes or both. On some plates it can be cut both inside and outside of the joint. The groove may be ground, flame cut, gouged, sawed, or machined on the edge of the plate before or after the assembly. Bevels and V-grooves are best if they are cut before the parts are assembled. J-grooves and U-grooves can be cut either before or after assembly. … Continue reading Back gouging in welding
In-situ Buttering welding
In-situ Buttering is deposition of a layer of weld metal on the susceptible surface (‘buttering’) prior to filling the joint ensures that strains due to the weld passes in contact with the steel are low. Or it is special buttering type different from the others – See Buttering vs Buildup in welding The deposition of low strength weld metal is deposited firstly on the susceptible plate before filling the joint with another electrode. However, before adopting this technique, design calculations should be carried out to ensure that the overall weld strength would be acceptable. Notes: Some O&G project has allowed using … Continue reading In-situ Buttering welding
Buttering vs Buildup in welding
The buildup is a surfacing variation in which surfacing material is deposited to achieve required dimensions. The term buildup denotes the addition of weld metal to a base metal surface, the edge of a joint, or previously deposited weld metal for the restoration of the component to the required dimensions. In this case, the strength of the weld metal is a necessary consideration in the component design. The Buttering is a surfacing variation used to deposit surfacing metal on one or more surfaces to provide compatible weld metal for the subsequent completion of the weld. Buttering differs from buildup in that … Continue reading Buttering vs Buildup in welding
Backing vs Retainer in Welding
The backing is defined as material placed at the root of a weld joint for the purpose of supporting molten weld metal. Its function is to facilitate complete joint penetration. Permanent backing is usually made from a base metal similar to that being welded and, as the name implies, becomes a permanent part of the joint because it is fused to the root of the weld and is not easy to remove — See: Backing in welding for more information. Temporary backing may be made from copper or a ceramic substance that do not become fused to the root and are easily … Continue reading Backing vs Retainer in Welding
Backing in welding
A backing (strip) is a piece of metal that is placed on the backside of a weld joint to prevent the molten metal from dripping through the open root (burn through). It helps to ensure that 100% of the base metal’s thickness is fused by the weld (full penetration). The backing may be either left on the finished (cofferdam or void space closing welds without both-sides accessibility) weld or removed following welding (Ceramic backing, Copper strips). If the backing is to be removed, the letter R is placed in the backing symbol. The backing is often removed from a finished weld … Continue reading Backing in welding
Groove Design & Bevel Preparation
Weld preparation Preparation for making a connection where the individual components, suitably prepared and assembled, are joined by welding or brazing. The dimensions below can vary depending on WPS. Angle of bevel The angle at which the edge of a component is prepared for making a weld. For an MMA weld on carbon steel plates, the typical angles is: 25-30 Deg. for a V preparation. 8-12 Deg. for a U preparation. 40-50 Deg. for a single bevel preparation. 10-20 Deg. for a J preparation Note: The value is only for reference, the angle and groove type is depending on structure design type, welding processes, and … Continue reading Groove Design & Bevel Preparation
WPS/PQR – JOINT DESIGN
Definitions: Welding Groove Design & Bevel Preparation What is Backing in welding What is Back gouging in welding What is Retainer in welding What is CJP, PJP in welding What is Buttering in welding, In Situ Buttering AWS D1.1: Non-Tubular vs Tubular and how to prepare the PQR WPS Codes/Specifications references for crosscheck the essential variables applied to write WPS/PQR: AWS D1.1: WPS variables – Joint design ASME IX: WPS variables – Joint design EN ISO 15614: WPS variables – Joint design API 1104: WPS variable – Joint design End Product Design Codes Notes on Welding WPS: ASME 31.3 (Process … Continue reading WPS/PQR – JOINT DESIGN
AMARINE 