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Typical failure fracture surfaces of resistance-welded heads (a) untreated; (b) A-350 °C-EtOH-5; (c) B-350 °C-EtOH-11; (d) C-350 °C-H2O-5; (e) D-350 °C-H2O-11; (f) E-500 °C-EtOH-5; (g) F-500 °C-EtOH-11; (h) G-500 °C-H2O-5; and (i) H-500 °C-H2O-11.
