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.
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Answer:
Mountain Ranges.
Explanation:
The natural boundary which shielded the Indus and Ganges Valleys from invaders to the north was mountain ranges. The world's tallest mountains that stood on the north of the Indua valley served as a guard to protect the Indus and Ganges valley from being invaded.
<u>Indus Valley is surrounded by the world's tallest mountain range of </u><u>the Hindu Kush, the Karakorum, and the Himalayas in the north.</u><u> Indus and Ganges valley form the most fertile landforms.</u>
Thus the correct answer is that the natural boundary of mountain ranges guarded Indus and Ganges Valley from being invaded.
Hektor’s perspective reveals his regret about previous actions.
Hektor, who was deeply worried, said to his own kind soul, "Ah me! Since he attempted to force me to lead the Trojans inside the city on that dreadful night when brilliant Achilleus sprang up and I refused to comply, Poulydamas will be the first to accuse me if I enter the wall and gateway at this time.
However, that would have been much better. As a result of my own carelessness, I have now destroyed my people.
The first bold indicates that he regrets making particular actions, and the second bold indicates the outcome of that actions.
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Direct democracy. the kind of government is called direct democracy.<span />
