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On the other hand, moving extremely fast can cause an undercut.Download Bhakti Ringtone Pagalworld free for android and iPhone. If you move very slowly, it will result in "cold-lap" and poor alignment. When welding along a vertical surface, pay special attention to the sides of the joints to prevent any error.Ī useful tip to find the ideal speed of moving the electrode further, is to form a weld pool (a pool of molten metal) and then drive the electrodes at a speed such that your electrodes are always at the leading one-third area of the weld pool. For example, you can manipulate the electrode side-to-side to form a step pattern. This detailed chart, which also contains a bolt and nut weight chart, provides you with the necessary information. This is a skill that you can acquire over time, through practice and by observing experienced welders at work. Manipulation of electrodes is nothing but the way the electrodes are moved to produce different results. When welding on a vertical surface, tilt it at the same angle away from the angle of movement. When welding on a horizontal surface, keep the electrode at an angle of 15 degrees towards the direction of movement. The ideal way to hold the electrodes, depends on whether you need to weld on a flat horizontal surface, or on a vertical surface. On the other hand, a larger arc may cause spatter and undercuts. If the arc is too short, then the electrode may stick to the metal surface due to low voltage. While the fact is that the arc length changes with the change of the electrodes, the general rule of thumb is that the length of the arc should not be greater than the diameter of the metal part of the electrode. If the set current is lower, the electrode will appear sticky whereas, if you apply higher current, the electrode may get scorched. It is advisable to change the applied current, 5 amps at a time, till you reach the optimum current setting required for the operation. Look for the current specifications mentioned on the electrode packaging. Which current you select, solely depends on the electrode you are using. The welding machine allows you to set the current as DC positive, DC negative or AC. Tungsten (W) : S table carbides and refines grain size so as to increase hardness, particularly at high temperatures. Niobium (Nb) : Grain refiner, used as a micro-alloying element ( Strength and Toughness)ġ4.
Titanium (Ti) : Grain refiner, used as a micro-alloying element ( Strength and Toughness)ġ3. Copper (Cu) : Used for weathering steelsġ2. Nickel (Ni) : Low Temperature applicationsġ1. Aluminum (Al) : Grain refiner, < 0.008% deoxidizer + toughnessġ0. hardenability and strength, particularly at high temperatures.ĩ. Molybdenum (Mo) : 1% is for creep resistance. Vanadium (V) : Strength and grain growth during heat treatmentĨ. Chromium (Cr) : H ardness, strength, and Corrosion ResistanceĤ. Carbon (C) : Carbon is a non-metallic element, It is a very strong austenitizer and increases the strength of steel.ģ. Important properties of Alloy Elements are as follows.ġ. The synergistic effect of alloying elements and heat treatment produces a tremendous variety of microstructures and properties. Therefore, alloys are used for engineering construction. Strength is the most important criterion by which many structural materials are judged. Alloys are usually stronger than pure metals, although they generally offer reduced electrical and thermal conductivity. Round steel weight (kg) 0.00617x diameter x diameter length Square steel weight (kg) 0.00785x side width x side width x length Hexagonal steel weight.
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