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23 Jan 2021

The welder uses the tip of the inner flame zone to heat the parts to be welded, as this is the hottest part of the flame. Figure 5.1 : Establishment of Flame in Oxy-acetylene Welding 5.3.1 Neutral Flame A neutral flame is obtained when equal amount of O 2 and C 2H 2 are mixed and burnt at the outlet of welding torch. A neutral flame has two zones: a hotter, lighter inner zone and a cooler, darker outer zone. If you want to join copper, cast iron, stainless steel, mild steel, and aluminum, etc, then using a neutral flame will be a good choice. A Neutral Flame is also used for Oxy Acetylene Cutting. Neutral flame is used to weld most of the metals. It is used to weld mild steel, stainless steel, cast iron, copper, aluminium … You can produce a neutral flame by increasing the … It is hotter than natural flame and has clearly defined two zones. oxygen & Actylene in equal proportion; More oxygen than … b. Oxidizing flame. At that point, the acetylene is being completely burned in the welding oxygen and surrounding air. 1. Oxidizing Flame. Gas Welding is a welding process that melts and joins the metals by heating them with a flame caused by a reaction of fuel gas and oxygen. It is a quiet and clean flame obtained by burning approximately 50% acetylene and 50% oxygen. In this method, the plate edges are heated immediately after the molten … oxidizing flame ; neutral flame; carburising flame ; slightly carburizing flame 23. It is generally preferred for welding. Neutral flame 3. The envelope also is shortened due to intense oxidation. The carburizing flame is best used for welding high-carbon steels, for hardfacing, and for welding non-ferrous alloys, such as Monel. The flame consists of two sharply defined zones inner white flame cone outer envelope of blue colour as shown in Figure 5.2. Carburising flame is used to weld Hard surfacing materials such as stellite Join The Discussion. The carburizing flame, in which an excess of acetylene is burned, is used when welding nickel alloys. Neutral. The neutral flame usually reaches a temperature around 5850°F with the end of the outer sheath dropping in temperature to about 2300°F. This type of flame is used when welding copper and alloys of … The neutral flame is extensively used for most of the welding work. ADVERTISEMENTS: (vi) Low alloy steels, etc. 21. A. As its amount increases, a white stream increases … This flame has … The welding flame should always be adjusted to neutral before either the … C. Cutting. In the case of neutral flame the weld pool and the filler metal come in contact with CO and H 2 in the acetylene feather. NEUTRAL FLAME.— The neutral flame does not alter the … Assertion (A): If neutral flame is used in oxy-acetylene welding, both … A Neutral Oxy Acetylene Flame is used for Welding, Brazing and Silver Soldering most metals and is therefore the most common type of flame to use. Types of Flame • There are three types of flames in oxyacetylene welding: • Neutral flame - Acetylene (C2H2) and O2 are mixed in equal amounts and burn at the tip of the welding torch. The intermediate zone … When one is welding using a neutral flame, the molten metal puddle is quiet and clear. The envelope is blue and the inner cone has reduced. … The slow opening of the gas fuel increases the ratio of it. Carburizing flame: To get a carburizing flame it is first necessary to create a neutral flame. The inner zone has very bright white color and has temperature of about 3300 … Open the oxygen valve and make adjustments until you get to a neutral flame; Depress the oxygen lever and make any necessary adjustments to the flame ; Torch Outfit Applications. This flame has an equal amount of oxygen and gases fuel by volume. Neutral flame is used for welding steel, cast iron, aluminium, copper and stainless steel. A well balanced neutral flame is used for welding most steels. Type # 2. Related entries. Gas welding is a welding process that melts and joins metals by heating them with a flame caused by the reaction between a fuel gas and oxygen. (v) Cast iron. This flame is of white … The combustion of acetylene is … The flux melts, solidify and forms a slag on the resultant weld bead. Applications: The neutral flame is commonly used for the welding of: (i) Mild steel. A gimlet is a _____ tool. Thermal conductivity of the materials c. Mechanical properties of the materials d. All of the above. The correct flame for preheating before cutting is . When steel is welded with this flame, the puddle of molten metal is quiet and clear, and the metal flows without boiling, foaming, or sparking. 3: Types of Flames Gas Welding Techniques There are two types of gas welding techniques: 1. The brass and bronze are welded by _____ flame. (1) A well balanced neutral flame is used for welding most steels. The flux may be used to deoxidize and cleanse the weld metal. To be sure that the flame is not oxidizing, it is sometimes used with a slight acetylene feather. Marking. • The neutral flame is commonly used for the welding of: – Mild steel Stainless steel – Cast Iron Copper – Aluminium 05/06/16 Hareesha N G, Asst. However, increased welding speeds are possible by using a slightly reduced flame. 24- In friction welding, the weld zone size depends on: a. (iii) Copper. B. B. Oxidizing. • An oxidizing flame can be recognized by the small … You need to attach a cutting head to the … A neutral flame is the correct flame to use for welding most metals. D. All of these. Figure: Oxy-acetylene welding outfits Types of Flames Neutral flame • The neutral flame is most often used for the welding of most of the materials like low carbon steels, cast steels, cast iron etc • The flame is produced when the gas mixture has equal volumes of acetylene and oxygen. The inner cone becomes short and pointed. Avoid excessive gas pressure because it gives a harsh … View Answer. Metal Cutting. Therefore, the metal boils, and when it gets cold, its properties drastically … Carburizing … In a neutral flame, all of the fuel gas is being burned in the process, resulting in a clean flame. ADVERTISEMENTS: (ii) Stainless steel. Neutral flame in gas welding contains . This excess Acetylene makes this flame reducing in nature and it’s suitable for welding aluminium … Oxidizing flame: The oxidizing flame is produced by burning acetylene with excess oxygen. Neutral flame is used for most welding operation and also for preheating during cutting operations. Oxy‐acetylene gas welding Oxidising flame. Surrounding this is a light blue flame … This flame is attained when welders, as they slowly open the oxygen valve on the torch body, first see only two flame zones. Neutral Flame. One may also ask, what are different Flames used in oxyacetylene gas welding? Oxidizing Flame: An oxidising flame is obtained when the supply of oxygen is more than that of acetylene. 2. You can send your comments directly at info@mechanicaltutorial.com. View Answer. The neutral flame is produced when equal quantity of oxygen and acetylene gases are used. a. To be sure the flame is not oxidizing, it is sometimes used with a slight acetylene feather. When carburising flame is produced? The metal should flow easily without foaming, sparking, or boiling. yUsed when welding copper and copper alloys but harmful when welding steel because the excess oxygen reacts withith the carbon, decarburi ingdecarburizing the region around theweld. View Answer. With some exceptions (e.g., platinum soldering in jewelry), the oxidizing flame is usually undesirable for welding and soldering, since, as its name suggests, it oxidizes the metal's surface. Comment * Related Questions on Workshop Technology. When steel is welded using neutral flame, the molten metal flows easily without foaming, sparking or boiling and the metal puddle is quiet and clear. Neutral flame contains equal proportions of oxygen and acetylene gases. The neutral flame is the most generally used flame for all heating and welding applications. In various burners, the oxidizing flame is the flame produced with an excessive amount of oxygen.When the amount of oxygen increases, the flame shortens, its color darkens, and it hisses and roars. Fig. Neutral flame. Between the inner cone and the outer envelope there will be a feather which generates due to the combustion of carbon containing element. See also Carburizing Flame, Oxidizing Flame, Reducing Flame and Oxyfuel Gas Welding. If natural flame is used for welding low carbon steels CO and H 2 do not have much effect on the mechanical properties of the weldment provided it is allowed to cool slowly. A very slight excess of acetylene may be used for welding alloys with a high carbon, chromium, or nickel content. However, increased welding speeds are possible by using a slightly reducing flame. Types of Flames in Oxy-Acetylene Welding: Carburizing flame In the carburizing flame the ratio of the gases are to be taken such that the gas containing carbon (Acetylene) will be in more amount and oxygen will be in less amount. Reducing Flame: In Reducing flame, excess acetylene is used. Generally, there are three types of flames used in Gas Welding, and those are: Neutral Flame; Oxidizing Flame; Carburizing or Reducing flame; Neutral Flame: Welding is generally carried out using the neutral flame sitting which has equal quantities of oxygen and acetylene. The neutral flame is the flame most generally used when welding or cutting. the total amount of acetylene consumed was 10 litre. Cutting is the most widely used process in torch welding. Motor generator set ; Engine generator set; Rectifier set ; Welding transformer 22. Oxidizing Flame: When the amount of acetylene reduces from natural flame or amount of oxygen increases, the inner cone tend to disappear and the flame obtain is known as oxidizing flame. Neutral flames can be used to melt and joint non-ferrous and ferrous metals. This flame is characterized by a greenish Acetylene feather between the inert cone and the outer envelope. The oxidizing flame, in which an excess of oxygen is burned, is used for welding bronze or fusing brass and bronze. Prof, DSCE, Bengaluru 49 50. b) Oxidizing Flame (O2 : C2H2 = 1.5 : 1) • If, after the neutral flame has been established, the supply of oxygen is further increased, the result will be an oxidizing flame. Left ward welding Left Ward Welding: In this welding the tip of the torch is held at 60 to 70°C to the plates. What type of flame is used for gas welding of cast iron? 26. In neutral flame oxygen to acetylene ratio is..... A. D. None of these. Amount of heat generated b. 0.8:1 B. The welder uses the neutral flame as the starting point for all other flame adjustments because it is so easily defined. The neutral flame has a clear, well-defined, or luminous cone indicating that combustion is complete. A Neutral Flame is so named because it has no chemical effect on the molten metal. The oxygen consumption from the cylinder is (a) 5 litre (b) 10 litre (c) 15litre (d) 20 litre 2. This variation in flame allows for some degree of temperature control during the weld. This type … In actuality, the steel itself is absorbing Carbon content from the flame and eventually produces heat. The same principle is important … The neutral flame, in which a balanced mixture of oxygen and acetylene is burned, is used for most welding operations. Carburising flame is produced when the quantity of acetylene is more than oxygen. The inner cone gives 2/3 of heat whereas the outer envelope provides 1/3 of the energy. The neutral flame is the primary flame used by gas welders. The inner zone consists of a luminous cone that is bluish-white. A neutral flame is one that has very nearly the same amount of both gases in the mixture. Due to excess amount, the combustion of acetylene remains incomplete. However, H 2 forming in a … This flame is used to weld medium carbon steel, nickel etc. The neutral flame is characterized by a temperature around 3200 degrees Celsius (5900 Degrees F), the absence of a hissing noise, a light blue outer flame and a sharp inner white flame. Neutral Flame: As the name implies, there is no chemical reaction on the metal, which is under operation. Oxidizing Flame: The oxidizing flame is obtained by just increasing the oxygen flow rate. A Neutral Oxy Acetylene Flame is used for Welding, Brazing and Silver Soldering most metals and is therefore the most common type of flame to use. c. Carburizing flame A very slight excess of acetylene may be used for welding alloys with a high carbon, chromium, or nickel content. Fig. View Answer. This flame has two distinct zones, a sharply outlined luminous cone and an outer flame surrounding the cone Oxidizing … Carburizing or Reducing Flame: The carburizing or … In gas welding of mild steel using an oxy-acetylene flame. The welding machine, which is used to convert AC welding supply to DC welding supply is . As very little CO is formed there is hardly any effect of such a reaction if at all it takes place. Oxidizing flame. Neutral flame is used for normal welding of steel, cast iron etc. Neutural welding flames are commonly used to weld: Mild steel; Stainless steel; Cast Iron; Copper; Aluminum; There are two clearly defined zones in the neutral flame. You can use torch welding for a variety of purposes including cutting, welding, and heating of metal. A. Boring. 9.2 Reducing or carburising flame . 25- For brazing and soldering, which of the following flame is used? State its applications. And the filler rod is inclined at 30 to 40°C in opposite direction. 1:1 C. 1.2:1 D. 2:1 Carburising flame is used for welding steel, alloy steels, non-ferrous metals, nickel … • Reducing flame - The excess amount of acetylene is used, giving a reducing flame. In TIG arc … It is chemically neutral and neither oxidizes or carburizes the metal being welded. Click to Enlarge. An oxyfuel gas flame that is neither oxidizing nor reducing. In this flame none of two gasses is supplied in excess. Oxidizing Flame; Reducing Flame; Carburizing Flame; Check Valve; Carburizing Flame Oxidizing Flame Oxyfuel Gas … C. Carburising. When a carburizing flame is used for welding, the metal under process gets boiled and cannot be seen clearly. -The neutral flame is commonly used for the welding at: 1) mild steel 2) stainless steel 3) Cast steel 4) Copper 5) Aluminum Oxidizing Flame: -If after the neutral flame has been established the Oxygen supply is increased to produce Oxidizing flame.-Oxidizing flame can be observed by the small white cone which is shorter,more bluer and more pointed than the neutral flame.-An oxidizing flame … This type of flame is used in most welding operations since the chemical effect of this flame on heated metal is the least. Oxy‐acetylene gas welding neutral flame yA higher ratio, such as 1.5 : 1, produces an oxidizing flame, hotter than the neutral flame (about 3300oC) butsimilarinappearance. (iv) Aluminum. Avoid excessive gas pressure because it gives … 13. As you can tell by the name, an oxidizing flame has a high content of oxygen (the oxygen and acetylene ratio being 1.5:1). 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