This will appear if the student enters that answer. Create feedback for any and all answers.For example will you accept "Ban Ki moon"? Use wildcards to allow for variants on a word pr phrase. You could give common misspellings partial credit with this option. Next, fill in the answers you will accept.Will you accept Ban Ki-moon as well as ban ki-moon as an answer? Case sensitivity can be tricky where capitalization is important. Choose whether the answers are case-sensitive.This is text that appears to the student after he/she has answered the question. Set the 'Penalty factor' (see Penalty factor below).the maximum number of marks for this question). Set the 'default question grade' (i.e.Select an image to display if you want to add a picture to the question (see step 4 in Multiple Choice question type for more detail).Tip: if the answer is intended to fill a gap in the text, use underscores (5 or more) to indicate where the gap is.If you're using the HTML Editor, you can format the question just like a word processing document. I hope the above article can be helpful for you who study Oxygen Acetylene Welding or OFW Welding. Now you know, what is Oxy-Acetylene Welding. See: Shielded Metal Arc Welding Machine Parts While the cold cracking occurs due to freezing weld bead. The distinguished in two categories heat cracks caused by the position of the weld bead is between the melting temperature and freezing temperatures. It can occur due to atmospheric contamination and high oxidation on the surface of the workpiece. Occurs due to a lack of precise parameters such as gas and welding speed is too high. It is usually caused by the welding speed is minimal or low gas pressure. These deformities occur due to lack of or non-occurrence of metal smelting gas and base metals. It can happen because the penetration is not performed on the entire thickness of the base metal, weld bead two are not mutually perform inter-penetrating and penetrating into the end of the fillet weld. Oxyacetylene welding disability is as follows: As is the case in other welding processes, welding defects can occur. To produce good quality, welding conditions should be running properly and the techniques and materials used must meet the standards. Suitable for light to medium duty cutting and weldingīecause gases are stored in the bottle has a pressure greater than atmospheric pressure, it should be noted strength steel bottle against the pressures of work because they are causing friction and movement of gas in the bottle, it should be known types of gas, sensitive to shock or increase in temperature.RG is Rod Gas and 65 is tensile strength 65.000 PSI.Usually, we use this flame for cutting materials from carbon steel. Oxidizing Flame: We use more oxygen than acetylene.Neutral Flame: Pressure oxygen and acetylene the same.Carburizing flame use application to soldering, silver welding and braze welding. Carburizing Flame: For this type, we use more acetylene than oxygen.If the gas has out from nozzle you can use lighter and light the torch. ![]() The third open valve in the torch, first acetylene after that you can open oxygen valve.Open Regulator Oxygen and Acetylene, set until the pressure matching with what do you want or for acetylene 5 to 7 psi and Oxygen 7 to 10 psi.The first we must Clean the nozzle, because if the head of the nozzle dirty will cause flame bad.Oxy Acetylene Welding Set Up and Pressure Settings Chart : For this reason, the Oxy-acetylene generator is limited to a maximum pressure of 5 atm. Keep in mind that pure Oxyacetylene is very susceptible to an explosion caused by pressure and temperature factors. Oxyacetylene nature is odorless and colorless. Therefore, Oxyacetylene often called hydrocarbon gas consisting of carbon, lime, and water. In the commercial world, to produce a reaction Oxyacetylene do activities calcium carbide and water. Purity can be achieved up to 99.5% and then used in steel tanks with a working pressure of 15-30 atm. So that needs oxygen purification repeatedly. Greater nitrogen boiling point and the boiling point of the gas is the only difference 13 0C only. The difficult problem is between Nitrogen and Oxygen. Then, by means of electrolysis, a mixture of air and water are separated by liquid oxygen. Technically, oxygen is obtained from liquefied air. Oxygen is obtained from the air where the air itself contains oxygen (21%), also contain nitrogen (78%), argon (0.9%), neon, hydrogen, carbon dioxide, and other elements that form a gas. In the process of burning the gases needed oxygen. Besides acetylene gas is also used hydrogen gas, natural gas, propane, for metals with a low melting point.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |