oil storage tanks

Tank you ducon, you are welcome.

A. As noted from Table 2-3a—Material Groups of API 650, the material ASTM A36 is located under two columns:

Group I As Rolled, Semikilled (must be semikilled or killed & Thickness ≤ 20 mm).

Group II As Rolled, Killed or Semikilled (Manganese content shall be 0.80–1.2% by heat analysis for thicknesses greater than 20 mm, except that for each reduction of 0.01% below the specified carbon maximum, an increase of 0.06% manganese above the specified maximum will be permitted up to the maximum of 1.35%. Thicknesses ≤ 20 mm shall have a manganese content of 0.8–1.2% by heat analysis).

From above we discover that ther is no any recommendation for proceeding a heat treatment (normalizing) for ASTM A36 before erection. Only there is my recommendation to proceed a preheating before welding to avoid heat choking and to avoid formulation of H₂ entrapped to your weldment.

B. There are a lot of weld defects, the following handbooks are free downloading and will be very interesting to you in that subject:

• Welding Manual

• Gas Tungsten Arc Welding (TIG) Handbook

• Guidelines for Shielded Metal Arc Welding (SMAW)

• Guidelines for Gas Tungsten Arc Welding (GTAW)

• Guidelines for Gas Metal Arc Welding (GMAW)

• Submerged Arc Welding

• Resistance Spot Welding

• Stainless Steels - Their properties and their suitability for welding

• Underwater Cutting and Welding Manual