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:
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<u>The following best describes the demographics of Europe:</u>
- Low birth rate
- positive migration
- low death rate
<u>Explanation:</u>
Europe is a developed country and reached to a higher level of population dynamics. The population pyramid looks like bell in Sweden, Germany and Britain because the population between the age group of 20-35 years is high in these countries.
The total life expectancy is also high in these western countries due to modern medical facilities and technological development. Immigration is very common in this continent due to pull factors. Birth rate and death rate both are low here that's why it reached the target of zero population growth rate.
Answer:
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The 2016 Puerto Rico Democratic primary took place on June 5<span> in the U.S. territory of Puerto Rico as one of the Democratic Party's primaries ahead of the 2016 presidential election.
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