Fundamentals of Welding, Gas, Arc and Thermit: A Text Book for Governmental Engineering Departments, Colleges, Technical Schools, Etc |
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Page 13
... material . ( e ) Standard material specifications . ( f ) Standard practice instructions . In the case of drawings showing welding , at least the Table I INFORMATION TO BE SHOWN ON DRAWINGS Information 1 Material 2 Size and shape 3 Type ...
... material . ( e ) Standard material specifications . ( f ) Standard practice instructions . In the case of drawings showing welding , at least the Table I INFORMATION TO BE SHOWN ON DRAWINGS Information 1 Material 2 Size and shape 3 Type ...
Page 27
... material with one layer , also , in arc welding , of using large electrodes and higher currents . The Backing Strip In gas and arc welding , a narrow iron or mild steel bar usually is satisfactory as a backing strip , as indicated in ...
... material with one layer , also , in arc welding , of using large electrodes and higher currents . The Backing Strip In gas and arc welding , a narrow iron or mild steel bar usually is satisfactory as a backing strip , as indicated in ...
Page 28
... material for the welding of copper and aluminum . The use of a metal backing strip in metal arc welding permits the use of a higher current , thereby securing better cross sectional fusion and greater welding speed . It is well to note ...
... material for the welding of copper and aluminum . The use of a metal backing strip in metal arc welding permits the use of a higher current , thereby securing better cross sectional fusion and greater welding speed . It is well to note ...
Page 43
... material that , lying loosely and open to the air will burn harmlessly if ignited by flame , becomes a most violent explosive if fired by a percussive detonator . It is a question of the rapidity with which a large volume of the mixture ...
... material that , lying loosely and open to the air will burn harmlessly if ignited by flame , becomes a most violent explosive if fired by a percussive detonator . It is a question of the rapidity with which a large volume of the mixture ...
Page 55
... material of which motor car axles are made . Use a vanadium steel welding rod and heat treat after welding . Galvanized Steel . This material should have the galvan- izing removed from the edges of the joint by the methods out- lined in ...
... material of which motor car axles are made . Use a vanadium steel welding rod and heat treat after welding . Galvanized Steel . This material should have the galvan- izing removed from the edges of the joint by the methods out- lined in ...
Common terms and phrases
acetylene amperes angle annealing approximately backing strip base metal bead bevel butt joint butt weld carbon arc carbon arc welding carbon steel carbon steel electrodes cast iron cent circuit compression cooling copper cost covered electrodes crucible cubic Curves cylinders degrees Fahr deposited metal diameter direct current double-bevel butt ductility Electric electrode EXERCISE fillet flame flux form of welding fusion welding gage gas and arc gas welding heat holes hydrogen increment joint edges layer length low carbon steel machine material melting metal arc welding method mold box molten necessary Norfolk navy yard obtained operator overhead oxide oxygen pinion pipe position practical preheating pressure puddle rail reactance regulator residual stresses riser riveted semi-rigid sequence sheet ship shown in Fig slag square inch student suitable surface tank temperature tensile strength thermit welding thickness torch tube type of joint voltage weld metal welder welding and cutting welding rod
Popular passages
Page 312 - Co. the composition is 67 per cent nickel, 28 per cent copper, and 5 per cent other metals, probably mostly iron and a little cobalt.
Page 43 - ... mean velocity of movement of the gaseous molecules at the high temperatures of combustion. The difference between this almost instantaneous detonation and the ordinary flame propagation may be compared to similar differences in the explosion of gun cotton discovered by Sir Frederic Abel. Gun cotton lying loosely, and open to the air, will burn harmlessly if ignited by a flame; indeed, a considerable portion may be laid upon the open hand and ignited by a flame without the smallest danger. The...
Page 568 - General specifications for inspection of material, issued by the Navy Department, in effect at date of opening of bids, shall form part of these specifications.
Page 77 - ... study of the appearance of the arc. What seems to occur is that the molten metal in the crater is in a state of violent surging, suggestive of a small lake lashed by a terrific storm. The waves are dashed against the sides of the crater, where the molten metal of which they are composed quickly solidifies.
Page 575 - Carbon not over 0.06 of one per cent Manganese not over 0.15 of one per cent Phosphorus not over 0.04 of one per cent...
Page 629 - Welded plates can withstand impact with a considerable degree of success; a half-inch plate of dimensions already quoted sustained two successive blows of 4 cwt. dropped through 12 feet, giving a deflection of 12 inches on a length of about 4 feet 6 inches without any signs of fracture in the weld.
Page 44 - A wide variety of flame conditions is possible with acetylene by different adjustments of the torch. A neutral flame is secured by reducing the amount of acetylene until only one white cone is visible. Outside of this cone is a nearly colorless flame of large volume. The neutral flame is not only the hottest, but it also prevents excessive oxidation of the molten metals by providing a reducing gas envelope. To readjust the welding flame...
Page 43 - ... the familiar statements concerning gun cotton, a material that, lying loosely and open to the air will burn harmlessly if ignited by flame, becomes a most violent explosive if fired by a percussive detonator. It is a question of the rapidity with which a large volume of the mixture is ignited. 132 If then the sudden firing of a relatively large volume of a gaseous mixture produces a detonation, it is quite evident that the rate of flame propagation is exceedingly high. For an oxygen-hydrogen...
Page 43 - ... tip and head made of metal of high thermal conductivity, pure copper for example, are beneficial. In fact, any construction that tends to maintain a cool gas flow seems to be helpful, and it is probable that in that fact lies the explanation for flashbacks caused by overheating of blowpipe parts. 129 It will be recalled that Davy's experiments showed that the critical-mixture proportions were affected by changes in temperature, that a slight increase in temperature made what is normally a non-inflammable...
Page 41 - The desirability of securing a non-flashback blowpipe has generally been considered to be due to its freedom from inconvenience and loss of time during welding operations and to its safety. Probably nothing is more detrimental to the poise of an operator and his desire to perform excellent work than an instrument that is constantly giving trouble. But the principal detriment in a blowpipe that flashes back, other than that of loss of time during welding operations, is in the possibility that a flashback...