Why it is called submerged arc welding?
Table of Contents
The flux forms a glass-like slag that is lighter in weight than the deposited weld metal and floats on the surface as a protective cover. The weld is submerged under this layer of flux and slag, hence the name submerged arc welding. The flux and slag normally cover the arc so that it is not visible.
What type of electrode is used in submerged arc welding?
Submerged arc welding (SAW) is a common arc welding process. The first SAW patent was taken out in 1935. The process requires a continuously fed consumable solid or tubular (metal cored) electrode.
Why is submerged arc welding so efficient?
As the arc is completely covered by the flux layer, heat loss is extremely low. This produces a thermal efficiency as high as 60% (compared with 25% for manual metal arc). There is no visible arc light, welding is spatter-free and there is no need for fume extraction.
How is submerged arc flux made?
The electrode is constantly fed into the arc and as it is melted, a layer of granular flux provides a protective cover beneath which the welding occurs. The blanket is created as some of the flux becomes molten. This fusible flux may consist of lime, silica, manganese oxide, calcium fluoride, and other compounds.
What are the disadvantages of submerged arc welding?
The followings are the disadvantages of submerged arc welding.
- It is limited to some ferrous metals like steel and stainless steel.
- It is also limited to long straight seams or rotated pipes and vessel.
- Backing strips are required for proper penetration.
- It is limited to high thickness materials.
Why is submerged arc welding referred to as submerged?
The slag layer acts as a protectant from contaminants that could damage the quality of the weld. The reason why this method is called submerged arc welding is because the molten weld and arc zone are “submerged” under the slag formed from the granular flux. The molten flux helps provide a current path between the electrode and workpieces.
Is submerged arc welding the right process for You?
The submerged arc welding (SAW) process has the potential to substantially improve deposition rates and productivity, and to provide repeatable weld quality. However, it is better suited for some applications than others. When considering SAW, there are numerous factors that can affect process success.
What is submerged arc welding used for?
The following are some of the benefits of using Submerged Arc Welding.
How does submerged arc welding work?
Pressure Vessels. Since SAW with the proper parameters can produce high-quality welds,it can be ideal for things such as gas tanks.