Resistance-welding processes make use of the heat generated electrical resistance to achieve fusion of the two parts to be joined; no pressure is used in these processes, and no filler :metal is added True False
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- Q3. What is a welding process? Write the classification of welding process write any two advantages and disadvantages of welding.Answer by true (T) or false (F) for the folling sentences 1. Fusion welding means that the two surfaces to be joined and the filler metal are meling during welding and then solidifying in similar menner to local casting process. 2. In oxyacetylene welding process, the welding is done using oxidizing flame only. 3. Explusive welding process produces strong joints of dissimilar materials that are not weldable by are. 4. Hot working leads to eliminating the porosity in the metal and increasing the strength and hardness. 5. Work hardening is a characteristic induced in the processing part because of the heat treatment.Q1: Explain what do we mean by rectifier? How it works, what type of welding machines have a rectifier in their components?
- During a TIG welding process, the arc current and arc voltage were 50 A and 60 V, respectively, when in the welding speed was 150 mm/min. In another process, the TIG welding is carried out at a welding speed of 120 mm/min at the same arc voltage and heat input to the material so that weld quality remains the same. The welding current (in A) for this process is» A Moving to another question will save this response. uèstion 18 In 'reverse polarity' of arc welding O A Electrode is connected to + and most of the heat is generated at the electrode O B. Electrode is connected to - and most of the heat is generated at the workpiece O C. Work piece is connected to + and most of the heat is generated at the workpiece O D. Work piece/is connected to-jandimost of the heat is generated at the workpiece Windows buau licyl Jäil e IT:ET T-T/-E//V ENG 4) %2:What are valid reasons for adding Yttrium to the zirconia in the Thermal Barrier Coating (TBC) in a turbine blade? Select one or more: O a. To match the thermal conductivity of the TBC to the metal substrate b. To avoid breakage during change in thermal conditions O c. To match the thermal conductivity of the TBC to the underlying oxide layer Od. To increase the weight of the TBC O e. To prevent a change of the crystallographic structure as the temperature changes
- A welding fabricator welds mild steel attachments to AISI 304 stainless steel shells, using GTAW with ER309L filler wire. A helium-based shielding gas (90% He-7.5%Ar-2.5%CO2) is used, but the high cost of this shielding gas is becoming an obstacle. To reduce costs,A resistance spot-welding operation is performed on two pieces of 1.5 mm thick sheet steel using 12000 amps current for a duration of 0.20 second. The electrodes are 6 mm in diameter at the contacting surfaces. Resistance is assumed to be 0.0001 ohms and the resulting weld nugget is 6 mm in diameter and 2.5 mm thick. The unit melting energy for the metal is 12 Jmm³. What portion of heat generated was used to form the weld?The welding parameters to be used to butt weld a metal alloy are being evaluated. In order to set up the welding machine, the melting factor for the metal (f2) has to be determined. The welding machine can deliver 4000 watts of power and the heat transfer factor for the welding process (f1) is 0.9. The final weld bead consists of 8 0% filler metal and 40% parent metal. The melting temperature of the filler metal and the parent metal is the same 2540 deg F. The cross-sectional area of the weld bead is 0.5 sq inches. The rate at which filler metal is added to the weld is 1 cu inch per min. Conversion factor 1 Btu = 1055 J and 0 deg F = 460 deg R Calculate the melting factor.
- An arc welding operation on nickel performs a groove weld, whose cross-sectional area = 20.0 mm2. The melting point of nickel Tm = 1725° Travel velocity = 4.0 mm/sec. Heat transfer factor = 0.82, and melting factor = 0.70. Determine the rate of heat generation required at the welding source to accomplish this weld.A solar panel is mounted on the roof of a house. Fig. 4.1 shows a section through part o solar panel. sunlight trapped air copper pipe, painted black water glass sheet insulating material metal backing sheet, painted black Fig. 4.1 A pump makes water flow through the copper pipes. The water is heated by passing through solar panel. (a) Select and explain three features of the solar panel that maximise the final temperatur the water.Gas welding is an example of pressure welding. Select one: True False