Question

identify the 70 in the aws classification for mild steel electrodes.

hydrogen level in ml/100 g
welding position
minimum tensile strength in ksi
indicates impact requirements
electrode
type of coating and current
indicates requirements of absorbed moisture test

Explanation:

Identify the classification components

Using the AWS Electrode Classification knowledge point

• E: Stands for electrode.
• 70: Represents the minimum tensile strength of the weld metal in thousands of pounds per square inch (KSI).
• 1: Indicates the welding position.
• 8: Indicates the type of coating and current.
• -1: Indicates improved toughness/impact requirements.
• H4: Indicates diffusible hydrogen level (less than \(4\text{ ml}/100\text{ g}\)).
• R: Indicates moisture-resistant designator.

Determine the meaning of "70"

Using the AWS Electrode Classification knowledge point

• The digits "70" in E7018 represent a minimum tensile strength of \(70,000\text{ psi}\), which is equivalent to \(70\text{ KSI}\).

Answer:

• Hydrogen level in ml/100 g
• Welding position
• Minimum tensile strength in KSI (Correct answer)
• Indicates impact requirements
• Electrode
• Type of coating and current
• Indicates requirements of absorbed moisture test