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- It has been reported that gas–tungsten arc welds of aluminum made in the overhead position (assumed lap weld joint) tend to have a significantly higher porosity level than those made in the flat position: a. Explain why b. Sketch the general view of the overhead position c. Indicate where the (most probable) location of the porosityReferring to Table 27-2, what commercial joining process can be used to braze sheet stainless steel?Referring to Table 27-2, what types of metals can electro- gas welding be used to join?
- A GTAW operation is performed on low carbon steel, whose unit melting energy is 10.3 J/mm3. The welding voltage is 22 volts and the current is 135 amps. The heat transfer factor is 0.7 and the melting factor is 0.65. If filler metal wire of 3.5 mm diameter is added to the operation, the final weld bead is composed of 60% volume of filler and 40% volume base metal. If the travel speed in the operation is 5 mm/sec, determine (a) cross-sectional area of the weld bead, and (b) the feed rate (mm/sec) at which the filler wire must be supplied.Describe the three applications of each Tee and Edge joint in welding?Give detail classification of all weldin processes and their practical applications.
- When welding using Oxyacetylene method on medium or high carbon steels, which type of flame is better (i) oxidizing or (ii) reducing flame? Justify your answera) explain the principles of Gas Metal Arc Welding (GMAW) b) explain three (3) modes of metal transfer for GMAW8 mm thick plates of S275 steel will be welded by SMAW, SAW, GTAW, GMAW and PAW processes. Evaluate weld groove preparation, welding parameters, welding consumables (electrode, shielding gas etc. ) heat input range, process advantages and economy for each welding process.