Using DCEN polarity in SAW improves which aspects?

Using DCEN polarity in SAW improves which aspects?

• A. Deposition rate and/or penetration.
• B. Only increases penetration.
• C. Always reduces deposition rate.
• D. No effect on deposition rate.

Answer: (A)

Using DCEN polarity in SAW shifts most of the heat into the workpiece because the electrode is negative and the base metal is positive. That higher heat input at the weld zone tends to give deeper penetration, which is why penetration is improved. At the same time, the way the filler metal is transferred and melted into the weld pool under this polarity can increase how efficiently filler metal is deposited into the weld, boosting the deposition rate. So this polarity can enhance either or both aspects depending on the process setup and material, making it the best choice when deeper penetration or higher metal deposition is desirable.

Using DCEN polarity in SAW shifts most of the heat into the workpiece because the electrode is negative and the base metal is positive. That higher heat input at the weld zone tends to give deeper penetration, which is why penetration is improved. At the same time, the way the filler metal is transferred and melted into the weld pool under this polarity can increase how efficiently filler metal is deposited into the weld, boosting the deposition rate. So this polarity can enhance either or both aspects depending on the process setup and material, making it the best choice when deeper penetration or higher metal deposition is desirable.