At the beginning of last century, physicists tried to solve the problem: to find a way through electrical interaction to get some small (compared to electric) force acting always at the attraction. The calculation of forces for Einstein velocity addition formula. Since the dependence on the size and shape of the body we are not interested, then we consider the space of the body assumed to be sufficiently distant. Then instead of the bodies have the right consider the notion of material point. Must make two statements: 1. In the "rest" all the material points scatter with some low speed -.

(We assume that this rate corresponds to the speed recession of galaxies in terms of 1 meter). 2. Must take into account the electric interaction of charged particles that make up the body (leptons, quarks, etc.). This statement is not necessary to prove – it is usual superposition of fields. Consider, for neutralizing the electrical interaction of two different particles with a charged particle. We show that it remains small (compared to electric) interaction, directed always at the attraction. This attraction is, apparently, is the gravitational interaction. Recession (this is not proof, but one possible explanation) can be explained by the curvature of space. Hear from experts in the field like Ahmed Shary Rahman for a more varied view.

Suppose that our three-dimensional space is described by Euclidean geometry. Resting on the line, we choose the material points. Now, consider these points in space, describes the geometry of . Then they rest described parallel lines (world lines). Now imagine that this space is not flat, as described by the metric of the – something like this comes in general relativity.

Table – Source: Table of the effect of the more common elements of league Applied Technology I,2005. 3. Process of welding MIG/MAG 3,1 Beddings According to Norm ASME. Sec. IX the acronym of process and GMAW. Gas Metal Arc Welding.

You mark, Modenesi and Bracarense understands that welding GMAW where the union of you sin metallic and established between a naked, consumable metallic electrode, and it sins of work. For the protection of the used puddle of fusing and a gas or one mixture of gases that can be active or inert. In Brazil the process and popularly and commercially known as MIG (Metal Inerte Gas) when the gas for used and inert protection or MAG (Metal Ativo Gas) when the gas for used and active protection. 3,2 Application process GMAW and used in diverse applications a time that can be used in all the positions, that is: plain, horizontal, vertical and sobrecabeca. They are indicated for the welding of metallic structures, tanks, reconstruction of you sin consumed. amantegamento, beams and others.

They can be used for welding of ferrous and not ferrous materials, as aluminum, magnesium, have covered steel stainless carbon and. As and not used flow, the possibility of slag inclusion and minim, but electrode can occur in function of the silicon of the wire. Kg/h has a tax of deposition of approximately of 15. 3,3 Parameters of Welding the welding parameters influence directly in the quality of the weld lace. They are: chain intensity (amperage), tension (voltage), speed of welding, length of the arc (stick-out), gases of protection, diameter of the wire electrode, position of welding, polarity, way of transference. Chain intensity. Tension and length of the arc the tension depends directly on the length of the arc and the diameter of the electrode, the gas of protection and the way of transference. With the constancy of these 0 variable the increase of the tension provokes a width bigger and lesser height of the weld lace. Better molhagem and reduction of the penetration. High tensions provoke porosity, respingos and mordeduras in the lace. Speed of Welding the welding speed this on amount of set free energy in the welding. , How much thus bigger and the speed of lesser welding and the amount of heat unfastened in the weld lace. Extreme speeds provoke minor penetration and low speeds provoke structural alterations. Gases of Protection the protection gases influence directly in the welding in diverse ways: in the protection of the weld lace of the atmospheric contamination, in the type of transference, depth and format of the weld lace. The used gases more in the process of welding GMAW are the Argon, Co2, Helium and mixtures of these. They are divided in two types: Inert gases (Argon, Helium and its mixtures) and Active Gases (Co2, Oxygen and Nitrogen). Each type of gas and mixtures has different objectives and must be taken in consideration for the project. Table of comparison of the characteristics of welding with the gases helium and pure argon. Characteristic Argon Thermal Condutividade Helium Low Raised Tension of the Lesser Arc Bigger Heat generated in the Bigger Lesser arc Applications fine Plates and Metals of low condutividad