Porosity is a cavity-like discontinuity and occurs due to the entrapment of gases in the molten weld pool. These entrapped gases don't get a chance to escape from the molten weld pool and hence cause porosity.
<h3>Which discontinuities are caused during welding?</h3>
Weld discontinuities can be defined as "an interruption of the typical structure of a weld, such as a lack of homogeneity in the mechanical, metallurgical or physical characteristics of the weld." Porosity is considered to be the most critical discontinuity. Weld discontinuities include porosity, incomplete fusion, excessive melt.
To learn more about welding visit the link
brainly.com/question/19997700
#SPJ4
B. Trail of tears
From 1831-1850 Native Americans were forced, by the government, from their ancestral homelands in the Southeastern US to to designated areas in the Western plains. Many of the Native Americans died on the journey from starvation, disease and exposure. Some of the tribes forced to relocate were the Seminole, Cherokee, Chickasaw and Ponca.
He asks <span>about a vehicle accident he saw earlier in the afternoon in another part of your base camp that did not involve you or your unit in any way.
For this, the appropriate response should be<em> </em></span><span><em>I don't have any direct knowledge about the accident, so I can't discuss it or answer your question.
</em>By being honest, you won't become a hindrance to the investigation rather than being a know it all in order to obtain a little bit of fame.<em>
</em></span>
The correct answer is letter C. It is also known as "lightning war." A military tactic that occurs fast and attacks the enemy's weak points through the use of armor and air power. This type of tactic preserves innocent human lives and lessens artillery cost.