Think in these terms of balancing the stresses as you go. End the weld properly. The crater that is left at the end of a weld as the metal cools, contracts and shrinks in upon itself is called a crater crack. As a general rule, they are to be avoided. Pay careful attention to the weld bead geometry.
Convex beads are more crack-resistant than concave beads.
Maintain a strong weld geometry. As I mentioned in previous articles, I keep important notes like this near my tool box for handy reference. Once you have read this, try the methods. I cannot say brazing is the answer without analyzing the joints and testing. Heat with soft flame until flux runs like water.