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    • #13266 Reply
      thanhlb
      Participant

      1)The risk of hydrogen cracking is greater when MMA welding:

      A) C-Mn steels.
      B) Austenitic stainless steel.
      C) Low alloy steels for elevated temperature service.
      D) Low carbon steels for cryogenical service.

      2)Initiation of a TIG arc using a high frequency, spark may not be allowed because it:

      A) Often causes tungsten inclusions.
      B) Can damage electronic equipment.
      C) Is an electrical safety hazard.
      D) Often causes stop/start porosity.

    • #13267 Reply
      bien
      Keymaster

      Q1: c

      Low alloy thường xãy ra nứt HIC nhiều hơn so với các đáp án còn lại.

      Q2: A

      Spark / Scratch-Start gây ra ngậm Tungsten.

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