19.01.2015

Meaning of different numbers

Mitosis is the process that a somatic cell divides into two daughter cells.A  It is an important process in normal organism development.
In welding, consumables are those materials that are used up quickly and need to be replaced. The American Welding Society (AWS), American Society of Mechanical Engineers (ASME), and other industry associations have tried to simplify the welder's job by standardizing consumables.
Due to the multitude of choices out there, an experienced welder, technician or welding engineer maintains a binder or computer based system holding the latest inventories available from different manufacturers or suppliers.
Entry-level welders should learn the standard classifications of common filler rods, wire and electrodes used by the companies they work for, and for the industry in general.
If you're new to the profession, you might be a little confused about the difference between an electrode and a filler rod. Stick welding on a pipe is one of the more difficult processes to learn, but there are more and more jobs available everyday. 8 - Since this last digit is sometimes combined with the third number to derive information about an electrode, it can cause some confusion.
Notice how the ingredients in the coating of the rod affect how the filler metal gets deposited in the weld, as well as the polarity required from the power source. These four categories are not easy for welding students to grasp at first, due perhaps to the lack of creativity in the naming conventions. The objective for using DCEP is to put 70% of the heat (that's generated by the electric arc) at the tip of the electrode, which can melt it with a vengeance into the joint. Although stick welding is primarily used on carbon steel, you can purchase rods to weld some stainless steels and aluminum. Consumeable sellers usually provide a chart that lists allowable amperage, based on rod diameter. As for choosing the right diameter of the rod, that depends on the type of joint you're creating and the thickness of the base metal.


Check out the Lincoln Electric stick electrode guide (PDF) to learn more about brands, specifications and other characteristics. So long as the rods remain sealed inside the box where they were originally packed, no special handling is required.
If you have any website suggestions or concerns, email welder [at] thecityedition [dot] com.
A When gametes from male and female parents meet, they form normal diploid chromosome number again. And since scores of product lines exist, along with a variety of classification systems, ordering these items can be something of an adventure. The binder should likewise include product spec sheets that describe in detail the properties of the material and compliance with AWS and ASME codes. You may be asked to fetch supplies from the storeroom or purchase some consumables from a local welding supplier.
Yet it helps to become familiar with the terminology, and to remember that not all stick rods work for every situation.
Although electrons inevitably flow through a circuit from its negative to positive sides, you can effectively reverse the current by switching the connections of your electrode holder and the work clamp. Now 70% of the heat gets focussed on the work plates, and only 30% reaches the tip of the electrode. If you ever have questions, consult a reputable source, like the Miller or Lincoln Electric websites, or read a textbook on the subject. The most common rod for stainless steel is 308, which works for base metals that are classified as either 304 or 308 using the AISI standard. Notice that the table recommends less current when welding in the vertical or overhead position.
Click to watch the movie tutorial on Mitosis and Meiosis" and see our genetics professor explain their difference in cell division.


While manufacturers produce their own proprietary brands and models, the products themselves can be cross-referenced to applicable industry classifications.
This information is essential when it comes to identifying which product will work best for a particular assignment.
Electricity supplied by a welding machine energizes the rod, which is attached to a metal clamp.
AC represents the familiar alternating current, which is an acceptable option for all the electrodes listed there, except E-6010. This situation is desirable when working with thin metal stock or a joint that doesn't require deep penetration.
Stainless steels, incidentally, are classified using three-digit numbers, falling mostly in the 200, 300 and 400 range. Lap joints, as you'll learn in school, require a lot less penetration and weld metal buildup than a beveled groove joint.
In a warehouse, or out in the field, it's common practice to warm batches of them in a rod oven at 250 degrees about 30 minutes to an hour before use. DCEN is also the choice of polarity for most TIG welding on metals other than aluminum, which prefers AC as its current polarity.
Finally, heat is a major concern when welding metals other than carbon steel, so the allowable current range factors heavily into choosing the right rod for stainless steel, other alloyed metals and aluminum. A welder fetches a handful of warm rods at a time, places them in an electrode pouch, then goes off to his work location.
Rods shouldn't be heated more than three times in an oven, so it's good practice to estimate your needs wisely on a daily basis.



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