Welding Defects in Hindi || Defects in Welding || Crack in Welding | Porosity in Welding
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bit.ly/3vvyyjq... can be caused by many different problems from rapid cooling to contamination. But in almost all cases, the reason cracking occurs is because the internal stresses exceed either your weld, your base metal or both. After you weld, both your base metal and your weld begin shirking as they cool
Porosity is the presence of cavities in the weld metal caused by the freezing in of gas released from the weld pool as it solidifies. The porosity can take several forms: distributed. surface breaking pores
What causes cracks in welding?
Crater cracking occurs when the welding operator stops welding prior to finishing a pass on a weld joint, leaving a wide, thin depression at the end. It can also appear in areas that have been tack welded when the corresponding weld passes does not meet fully against the tacks
How do you fix cracks in welding?
Repairing Aluminum Welds
Use an angle grinder to completely remove the cracked weld. ...
Next, vigorously brush the area to be welded using a stainless-steel wire brush. ...
Weld in a well-ventilated area free from flammable material and remember to wear proper skin and eye protection.
What are common welding defects?
Most defects encountered in welding are due to an improper welding procedure. Once the causes are determined, the operator can easily correct the problem. Defects usually encountered include incomplete penetration, incomplete fusion, undercutting, porosity, and longitudinal cracking
How do you prevent hot cracks in welding?
Hot Crack: How it occurs and how it can be prevented
Use lower heat input. The use of lower heat input increases the cooling speed of the weld metal, which minimizes the time spent in the brittle temperature range. ...
Use larger groove radius. ...
Use ferrite-controlled filler metals.
Can you weld over a bad weld?
It should be remembered that welding over weld metal is actually a very common occurrence. Multi-pass welds after all are manufactured by welding over weld metal! There are also many accepted procedures in which welds overlap. ... Another factor to consider is compositional variation between the two welds.
What is repair welding?
Repair welding is a commonly used technique in which the cracked material is removed by arc gouging and the element is welded to re-join the material on either side of the crack
types of porosity in welding
porosity in welding causes
effect of porosity in welding
undercut in welding
welding defects
remedies of porosity in welding
cluster porosity in welding
name three possible causes of porosity in welding
How do you fix porosity in welding?
Fixing Problems Related to Weld Porosity
Cause: Impurities on the surface of your metal. Solution: Clean your metal thoroughly before you weld it. ...
Cause: Excess shielding gas. Solution: Use the correct amount of shielding gas. ...
Cause: Damp electrodes. ...
Cause: Backing bar material that doesn't match the metal you're welding.
Can you weld over porosity?
It's important to understand that any weld with porosity is compromised and will seriously be lacking in structural integrity. So if any type of force is going to be exerted on your weld, it needs to be redone
![[Hindi/Urdu] Welding defects](/img/n.gif)
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Thanks sir 👍
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Thank-you so much sir very helpful
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Nice video sir
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Nice video Technical
Thnx sir 😊
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Osm sir
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Sir what is mean by OD and ID views of crack in dissimilar weld of heat exchanger
Internal diameter
Outer daimeter
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