All these are correct.
When using the Shielded Metal Arc Welding (SMAW) process, the essential elements for making a good weld include:
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Correct electrode size, angles and amperage: Choosing the appropriate electrode size and ensuring proper angles relative to the workpiece, along with setting the correct amperage for the material being welded, are crucial for a good weld.
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Proper arc length: Maintaining the right arc length is important for achieving a stable arc and good penetration.
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Proper travel speed: Adjusting the travel speed affects the heat input and weld bead characteristics, which are vital for producing strong and aesthetically acceptable welds.
In summary, all these factors play an important role in achieving a high-quality weld in the SMAW process.