Gujarat has come a long way and plays an important role in today's. It has a long history about its own struggle.
Historically the present-day state of Gujarat has been one of the main centers of the Indus Valley Civilization. It contains major ancient metropolitan cities from the Indus Valley such as Lothal, Dholavira, and Gola Dhoro. The ancient city of Lothal is the site of the India's first port. Also Dholavira, the ancient city, is one of the largest and most prominent archaeological sites in India, belonging to the Indus Valley Civilization. The most recent discovery was Gola Dhoro. All together about 50 Indus Valley settlement ruins were discovered in Gujarat.
The Dravidian tribes were the original inhabitants of the region. The ancient history of Gujarat was enriched by their commercial activities. There is a clear historical evidence of trade and commerce ties with Sumer in the Persian Gulf during the time period of 1000 to 750 BC.Later Gujarat was settled by the Aryans. Then there was a succession of Hindu kingdoms including the era of the Gupta dynasty and culminating in the reign of the Solankis. The 9th century history of Gujarat saw the emergence of the Muslims in the political arena of the state. The first Muslim conqueror was Mahmud of Ghazna whose conquest of Somnath effectively ended the rule of the Solankis.
Today its one of the most important state of our country to know more.
Please click...
Gujjus>>>
21 Facts about Gujarat...
Three Important element of Fitness
If you've ever watched kids on a playground, you've seen the three elements of fitness in action when they:
1. run away from the kid who's "it" (endurance)
2. cross the monkey bars (strength)
3. bend down to tie their shoes (flexibility)
Parents should encourage their kids to do a variety of activities so that they can work on all three elements.
Endurance is developed when kids regularly engage in aerobic activity. During aerobic exercise, the heart beats faster and a person breathes harder. When done regularly and for continuous periods of time, aerobic activity strengthens the heart and improves the body's ability to deliver oxygen to all its cells.
welding defects
Welding Defects
This article will cover some welding defects that are sometimes overlooked or not considered. Each welding project requires careful considerations. They include:
* The process, the type of welding i.e. stick, MIG, TIG.
* The composition of the base metal and thickness.
* The welding position, i. e. flat, vertical, horizontal, overhead.
* The weld joint and type.
* Electrical supply and equipment.
* And finally, the welding techniques to be used.
To minimize the chance of welding defects be sure to consider 1) the travel speed of the pass; 2) the size and type electrode; 3) machine settings; 4) make sure the welding is done in accordance with the plan and the current conditions.
Most of, or a great deal of, welding defects can be identified by the "naked eye." By knowing what is likely to produce welding defects you will learn how to avoid them. Production without defects saves time, materials, repair costs, and a decrease in productivity.
The two following causes for weld rejection should not be but are often overlooked 1) is the weldor proficient with the process being used? 2) is the welding rod supply up to standards? Use only properly stored, dried, and maintained welding rods. (Check out our entire inventory of Welding Rod Ovens.)
Welding defects include poor penetration. It's the failure of the welding rod and base metal to fuse together. It's caused by a root face that is too big; a root opening that is too small; an electrode that's too large; slow travel speed or a machine setting that's too low.
Poor fusion is the failure to blend the layers of weld metal together with the base metal. A lack of fusion is caused by " . . . failure to raise to the melting point of the base metal or the deposited weld metal," (Miller Electric Mfg. Co.) It's caused by improper fluxing; dirty plate surfaces; improper electrode size or type; wrong current settings. Electrodes that do not meet the storing, drying and maintenance specifications also cause it.
Undercutting is another problem that causes welding defects. It burns away the base metal at the toe of the weld. It's caused by a current adjustment that is too high; an arc gap that is too long or failure to fill up the crater completely with weld metal.
Porosity looks "sponge like," or like tiny "bubbles" in the weld. It's caused by gases being released by the cooling weld because a current setting is too high or arc is too long.
Slag inclusion occurs when the slag is not chipped and cleaned properly and then another pass is made over the top. To avoid, 1) prepare the groove and weld properly before each pass; 2) thoroughly clean in between passes; check the machine settings against those suggested by the manufacturer; 3) hold a smaller weld puddle.
What does a welding inspector does?
Welding Quality Control
WELDING SYMBOLS
SS 304-316
BASICS OF WELDING (FOR STUDENTS)
AIR CAR
Pre fabricated house
Alloy steel
What is micro air vehicle?
Subscribe to:
Posts (Atom)