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CYCLING ACTIVITY FOR THE BACK TO SCHOOL

Hi, guys: Monday is the deadline for home stacks up ideas. After reading the contributions made (many are repeated) seems to me that the most feasible is to enter on this page: http://centros5.pntic.mec.es/ies.victoria.kent/Rincon-C/Practica/ PR-11/PR-11.htm, provided by Matthias and bring the information contained therein to work with Luis Martinez in Physics.

By 1 Wednesday that work on the show, should bring materials that have been selected for the construction of the model, for groups. And, now, Happy Holidays!! Laura

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Remember ...

Boys: remember that the activities outlined in this blog are only for this week: 6 to July 10. From this date we all holiday and send contributions will not be published, so it is deemed not to have sent the material. The reason is that I need time to read the contributions of you and select which ones will lead to physics class, right?

Best regards and I look forward to more batteries!

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I leave Lila's contribution could not upload it to the blog

How to build a battery at home?: WORKS!

A stack is a device that allows for an electrical current from a chemical reaction. In this experience we will teach you to build a homemade battery also works.
Material you will need:

• A glass bottle of vinegar
• A piece of copper pipe (of which are used for water pipes)
• A metal pencil sharpener pencil sharpener or
• Power Cables
• A device that we do operate on the stack. Good results are obtained with devices that have some musical greeting cards. You can also serve as an alarm clock of which run on batteries.

How to build the battery?
Every battery has two electrodes (usually two metals) and an electrolyte (a substance that conducts electricity). In this case we will use as electrodes metals copper and magnesium. In particular, we will use a copper pipe and a pencil sharpener, which contains magnesium metal body. As electrolyte we use vinegar.
Building battery is very simple you just insert the electrodes inside the vinegar in a glass content and attach a wire to each (as shown in the figure).
must take care that the copper tubing is thoroughly cleaned. To clean you can rub it with a paper sand.
"How do you work?
function works just connect the two wires from the electrodes to a battery-powered device. The problem is that this battery provides a current very low, because it has a high internal resistance, so do not always going to get it to work. You have to choose the appropriate device: a device that requires very little power. For example:

• A device for playing a song on toys babies or those who have taken up some greeting cards (musical)
• A watch batteries (used an alarm clock)

Just connect the battery wires to the two poles the battery of the device. But do not forget to look for what is the correct polarity, but the unit may not work.

NOTE: While not used, it should be outside the sharpener vinegar to prevent a reaction. Notice that when they come into contact, magnesium sharpener reacts with the acid in vinegar and shed many bubbles. Gas is hydrogen.

Keep experimenting
can try to run other devices with this battery. Probably get a small electric motor.
can also try building other batteries using other metals and other electrolytes. The problem that you are getting is that the intensity you get is very low and you will find it difficult to operate the equipment. But if you have a multimeter (measuring apparatus intensities and electrical potential differences) on hand you can sense the current obtained.

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Hi, guys! I answer some questions that are repeated:

pages on batteries, I am going to go as you read on the rise, but you have to read what your peers are going to try not to repeat, yes? When you reach the end of this week, I'll tell you what going to have to take to school for Luis decide to which ones will work.

With regard to the material on the cycles, they will bring to class for Wednesday 29, along with the materials needed to assemble the models, it is understood? Anything

, communicate with me in this way or my box.

Affections. Laura

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ALUMINIUM WELDING MACHINE, STAINLESS STEEL AND OTHER MATERIALS

These machines are suitable for welding ferrous and nonferrous metals. They have a wide range of welding, as they can weld the entire line of coated electrodes.
Suitable for welding ferrous materials, aluminum, brass, stainless steel, cast iron, very thin veneer, etc. Weld
These teams have the unique feature of AC output and DC AC / DC. They come equipped with electronic control that allows you to choose with great accuracy the appropriate point on the power required for each weld.
circuit full-wave rectification and filter inductor, make arc has a start quick, easy and great stability. Addition these machines have the particularity of welding very thin sheets, has an additional output for this type of welding. Another feature is that it also can be used as TIG.

Some of these are:

And prices can be found on the network, conform to the type of user and his need, for example:

Welding Wire 40-180amp 220v 0.6 A 1mm Pro Dowe. $ L166080

welding spot welding regulator $ 160480

digital welding wire $ 1,131,111 220 Mig

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In MIG always used filler materials, while TIG welding may or may not use. The best properties of the welded joint in terms of strength, corrosion and no cracks were obtained when using these materials.

There is no general rule for the choice of filler material due to the type of use and the parameter that more interested in each case. The high magnesium content AlMg give greater strength, while that of AlSi is more resistant to cracking and provides better flow of metal during the melting process of hardenable alloys.

Such alloys (AlCu - AlMgSi - AlZn), should not be welding filler metal alloy in the same group by the cracking process. In the event that the material is to be anodized after welding, material should be avoided because it will catch AlSi filler in the weld area very dark.

To reduce the risk of stress corrosion and increasing resistance has been added Cu alloys AlZnMg. Doing this also worsens the weldability. Several studies point out that you can add a maximum 0.2% Cu, before the danger of hot cracking increases considerably. Is chosen in this case the AlSi.

CLEANING BEFORE WELDING


cleaning prior to welding is essential to achieve good results. Dirt, oil, grease, moisture and oxides should be removed beforehand, either by mechanical or chemical. For normal work workshop can choose the following procedure: 1,
Removing dirt and cold degreasing with alcohol or acetone.
2 º Wash with water and dry immediately to avoid the risk of oxidation. Mechanical removal
3 º by:
- Brushed steel with a rotating brush.
- scraping with abrasive sand or lime.
- By blasting.

When most demanding requirements regarding the preparation, you can perform a chemical cleaning schedule is as follows:

- Removal of dirt.
- Degreasing with PERC at 121 ° C.
- Washing with water and dried immediately.
- Elimination of aluminum oxide as follows:
- Cleaning alkaline NaOH.
- Acid cleaning with HCl + HF + HNO.
- Washing with water and dried immediately.
- Neutralization with HNO (after treatment with NaOH).
- Bath in deionized water.
- Instant drying with hot air.

should never be dispensed with rust removal or degreasing in the welding area, but sometimes generates a high cost.

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CONTRIBUTION IN ALUMINUM WELDING

aluminum alloys arc welded under inert gas (argon, helium or a mixture of both) and there are two techniques:

ARC WELDING ELECTRODE inert atmosphere REFRACTORY OR PROCEEDING WITH TIG (Tungténe Inert Gas).

This procedure is blown arcing between a tungsten electrode and refractory workpiece, while a stream of inert gas (usually argon) surrounding the electrode, protecting the melt against oxidation.
A filler rod (usually fastened by hand) fed the bathroom.

This procedure uses an alternating current source. It is used in thicknesses between 1 and 6 mm and can be automated.


Long Pulse Welding

Many energy sources are capable of TIG welding pulse. For others you can easily connect an additional drive. The principle is similar to MIG welding - pulse, with the only difference being that the solder TIG is carried out with a much lower frequency, approximately 10 Hz This means that the pulses are clearly visible which can be a source of limitation for the welder. The technique can be applied to welding with AC as DC. It works with two current levels. The lowest is chosen to not turn off the bow. The highest level is generally higher than in normal TIG welding. Periods of different levels may vary. The advantage is that you can get a perfect weld with an average current intensity of lower than normal solder. The heat input is lower and you can weld thinner material: 0.3 to 0.4 mm. With the combination of CC and pulse can be welded thickness of about 0.05 mm.


ARC WELDING IN INERT ATMOSPHERE OR PROCEEDING WITH CONSUMABLE ELECTRODE MIG (Metal Inert Gas)

This welding process, the aluminum or aluminum alloy serves both electrode and filler metal. Supplied in pre-coiled wire into a coil, which automatically unrolls to the welding tool as it is consumed.
welding energy is supplied by a DC source. The connection is made with reverse polarity in part to ensure the melting of the electrode wire.

This procedure, used for products with a thickness exceeding 2.5 mm., is also automated. The manual version is commonly called MIG welding semi-automatic.

In recent years, manufacturers of welding material proposed pulsed power sources. This equipment can weld thin thickness of 1.5 to 4 mm. easily. For media thickness and thick, its advantage over the classical sources is demonstrated.


MIG welding thick material

The recent use of thick aluminum, alloy particularly AlMg, 5mn, has led to the development of a technique, specially adapted for this purpose, based on the MIG method.
You can mention the method of Sciaky NARROW GAP, which stands obliquely placed one after the other allows the butt welding without edge preparation and an opening of 6-9 mm. for thick materials. In Japan has developed the method NHA (HORIZONTAL NARROW GAP welding process for aluminum) for horizontal openings. A double glass torch swinging motion is automatically guided along the joint. The advantages of these two variants in the best MIG involve use of heat and the smaller size of the board, leading to an increase in productivity. Table


recommended amps for MIG

diameter Current thread (A)
0.8 mm from 80 to 140
1.2 mm 120 to 210
1.6 mm 160 to 300
2.4 mm 240 to 450

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WHAT IS THE WELD?

Welding is a process where union is made of two materials, usually achieved through fusion, in which the parts are welded by fusing the two and adding a molten filler material (metal or plastic), which has a melting point lower than the piece welding, to get a bath of molten material (called the weld) which, when cooled, becomes in a strong union.

Sometimes the pressure is used in conjunction with heat, or by itself, to produce the weld, which contrasts with the soldering, which is the melting of a material of low melting point, between pieces of work to form a bond between them, without melting the workpieces.

Many different energy sources can be used for welding, including a gas flame, an electric arc, laser, electron beam, and friction or ultrasound.

The energy required to form the joint between two pieces of metal usually comes from an electric arc, while the energy for welding merger or thermoplastic usually comes from direct contact with a tool or a hot gas.

While it is often an industrial process can be welded in many different environments, including outdoors, underwater and in space. Regardless of the location. Even this, welding remains dangerous, and should take precautions to avoid burns, electric shock, poisonous fumes, and overexposure to ultraviolet light.