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What is the purpose of back gouging?
Back gouging is a process of cutting a groove in the back side of a joint that has been welded. Back gouging can ensure 100% joint fusion at the root and remove discontinuities of the root pass. This process can also remove the root pass metal if the properties of the metal are not desirable to the finished weld.
What is the reason for back gouging some welds?
The removal of weld metal and base metal from the other side of a partially welded joint to assure complete penetration upon subsequent welding from that side.
What is the purpose of gouging?
Unlike MMA welding where a stable weld pool must be maintained, this process forces the molten metal away from the arc zone to leave a clean cut surface. The gouging process is characterised by the large amount of gas which is generated to eject the molten metal.
What is the purpose of backing?
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.
How is gouging done?
Air carbon arc gouging is a process of removing metal by means of heat generated from a carbon arc. The process uses a carbon/graphite electrode, compressed air and a standard power source. The intense electric arc used between the tip of a carbon electrode and a metal work piece cuts and melts the work piece.
What is metal gouging?
Gouging is the term to define a type of corrosion which occurs on a metallic surface in which a hole, groove or indentation is created. Particularly in maintenance and repair, the ability to gouge or groove metal is critical and deserves full consideration.
What is the definition of back gouging?
[′bak ‚gau̇j·iŋ] (metallurgy) The elimination of excess material from both weld metal and base metal on the opposite side of a partly welded joint; a groove or bevel is formed in order to facilitate complete joint penetration.
What is back gouge?
The removal of weld metal and base metal from the weld root side of a welded joint to facilitate complete fusion and complete joint penetration upon subsequent welding from that side.
Can you gouge without air?
Recommended Cutting / Gouging Techniques: No special equipment required. Cutting can be performed Flat, Vertical Up, Vertical Down, Horizontal, or Overhead. Use AC or DC straight polarity.
What is the purpose of a backing gas in GTAW?
GTAW process uses an inert gas for both shielding and backing of the weld. Backing gas also known as purge gas, is provided mainly to prevent oxidation of root pass weld from inside the pipe.
What is back gouge weld?
What do you need to know about backgouging?
Backgouging The removal of weld metal and base metal from the weld root side of a welded joint to facilitate complete fusion and complete joint penetration upon subsequent welding from that side.
What is the purpose of back gouging in welding?
Sometimes plates are either grooved and welded or just welded on one side and then back-gouged and welded. Back gouging is a process of cutting a groove in the back side of a joint that has been welded. Back gouging can ensure 100% joint fusion at the root and remove discontinuities of the root pass.
Which is the best tool for back gouging?
When the metal isn’t too thick, it doesn’t take too long and doesn’t require a lot of gouging – an electric or air grinder is sometimes an ideal tool when it comes to back gouging. Based on the configuration of the joint, either a thick or a thin coarse or rough disc may be the ideal tool to get the task done.
Do You Back gouge or grind metal in welding?
If you want to assure a full penetration weld joint, I would strongly recommend to back gouge (grind) and add weld metal, as required. Also to add to metengr’s reply if you are working to ASME 8 your joint efficiencies will be less if you remove the backing strip and do not grind / gouge to sound metal and weld out.