Oxy-Acetylene Welding of Steel & Iron There are many different varieties of steel, but from a welding standpoint they may be classified by their carbon content. Those having a high carbon content are called hard steels; those with a low carbon content, soft steels. Wrought iron may be treated the same as mild or soft steel. To be sure, there
Read more →Underwater Welding Although underwater welding does not have as many applications in marine salvage operations as underwater cutting, welding is an extremely important and useful process. By substituting welding for mechanical methods of joining, the overall cost and time spent on the job can be reduced considerably. Historically, most underwater welding was done for the purpose of making temporary repairs
Read more →Exothermic electrode cutting technique. The 1/4-inch Exothermic electrode may be used to cut steel up to 1/2 inch in thickness. The 1/4 inch electrode leaves a narrow kerf and is preferable for fine cutting. When visibility is poor or when cutting heavier steel, the 3/8-inch electrode is more efficient. The following techniques are recommended: a. Insert the electrode into the
Read more →Steel-Tubular Electrode Cutting Technique (cast iron and non-ferrous metals). Cast iron and non-ferrous metals do not oxidize; therefore, underwater cutting essentially becomes a melting process. There is no chemical reaction of the oxygen and the base metal. Therefore, the only benefit realized by the oxygen is the mechanical effect of blowing the molten metal away. Since the melting process takes
Read more →a. General. Oxygen is a colorless, tasteless, odorless gas that is slightly heavier than air. It is nonflammable but will support combustion with other elements. In its free state, oxygen is one of the most common elements. The atmosphere is made up of approximately 21 parts of oxygen and 78 parts of nitrogen, the remainder being rare gases. Rusting of
Read more →Oxy-Acetylene Cutting Oxy-acetylene torches have an attachment for cutting, which can be attached to the welding torch. Here the flow of oxygen is controlled a lever. In planning the job, have the tanks firmly secured to prevent tipping over, the hose should be BEHIND you so as to protect it from damage due to flying sparks. Make certain also that
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