Category: Welding Engineer

WELDING, Welding Engineer6 Comments

In-situ Buttering welding

Amarine Antonio

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

WELDING, Welding Engineer7 Comments

Buttering vs Buildup in welding

Amarine Antonio

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

WELDING, Welding Engineer3 Comments

Backing vs Retainer in Welding

Amarine Antonio

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

WELDING, Welding Engineer7 Comments

Backing in welding

Amarine Antonio

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

WELDING, Welding Engineer4 Comments

Groove Design & Bevel Preparation

Amarine Antonio

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

WELDING, Welding Engineer2 Comments

WPS/PQR – JOINT DESIGN

Amarine Antonio

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

WELDING, Welding Engineer1 Comment

Welding Work Clamp (Return line)

Amarine Antonio

Work Clamps The work clamp must be the correct size for the current being used, and it must clamp tightly to the material. Heat can build up in the work clamp, reducing welding efficiency. Power losses in the work clamp are often overlooked. The clamp should be touched occasionally to find out if it is getting hot. In addition to power losses due to poor work lead clamping, a loose clamp may cause arcing that can damage apart. If the part is to be moved during welding, a swivel-type work clamp may be needed, It may be necessary to weld … Continue reading Welding Work Clamp (Return line)

WELDING, Welding Engineer2 Comments

Welding Cable or Lead set-up

Amarine Antonio

The terms welding cables or welding leads are used to mean the same thing. Cables used for welding must be: 1- Flexible 2- Well-insulated 3- Correct size for the job. Most welding cables are made from stranded copper wire. Some manufacturers sell a newer type of cable made from aluminum wires. The aluminum wires are lighter and less expensive than copper. Because aluminum as a conductor is not as good as copper for given wire size, the aluminum wire should be one size larger than would be required for copper. The insulation on welding cables will be exposed to hot … Continue reading Welding Cable or Lead set-up

WELDING, Welding Engineer1 Comment

What is Duty Cycle in Welding

Amarine Antonio

The duty cycle is the percentage of time a welding machine can be used continuously. Most SMA welding machines cannot be used 100% of the time because they produce some internal heat at the same time that they produce the welding current. SMA welders are rarely used every minute for long periods of time. The welder must take time to change electrodes, change positions, or change parts. The duty cycle of a welding machine increases as the amperage is reduced and decreases as the amperage are raised. Most SMA welding machines weld at a 60% rate or less. Therefore, most … Continue reading What is Duty Cycle in Welding