The power assisted steering pipeline and supports are most important parts in automobile brake system. Although arc welding is also available, but its operation is difficult and low efficient and the defective rate is high and hard to meet the design requirements. According to the pipeline structure characteristics and working conditions, flame brazing is the best welding method. When compared with other welding methods, the oxy-hydrogen flame brazing has the following advantages:

1.Making minor changes and deformation on welding head and mechanical property, high precision of work pieces dimension.

2.Available to weld dissimilar metals and other dissimilar materials, no strict limitations work pieces thickness difference.

3.Available to weld multiple work pieces and heads in high efficiency.

4.Since heat affected zone is small and oxy-hydrogen flame is intensive, welding precision is high.

5.Smooth and beautiful welding spots. Since there are no beginning compositions 
generated in oxy-hydrogen combustion, no black dirt spots are left on work piece, so the work piece is free of secondary cleaning and polishing.

6.Equipment simple and low investment, save 60% of costs than acetylene.

7.No environment pollutions.

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