Milk is transported from farms to dairies in tanker trucks. An $8,000$ gallon milk tank is normally made of Type $304$ or Type $316$ stainless steel. To make the tank, sheets of stainless steel are welded together. Based on your knowledge of sensitization in stainless steel welds, how do you think the manufacturers prevent sensitization at these welds? Which of the three methods we discussed in class are good choices?