铝合金搅拌摩擦焊时焊接速度与热输入的关系

Relation of welding speed and heat input at aluminum alloy friction stir welding

关键词:  搅拌摩擦焊  焊接速度  热输入

Key words:  friction stir welding  welding speed  heat input

摘要:

与熔化焊时热输入和焊接速度成反比不同,搅拌摩擦焊时焊接速度与热输入的关系非常复杂.文中从摩擦产热和金属塑性变形产热出发,研究了搅拌摩擦焊时焊接速度与热输入的关系,以及相同旋转速度与焊接速度比值时焊接速度与性能的关系.结果表明,在搅拌摩擦焊时,焊接速度与热输入不呈线性关系,而是呈现复杂的形态,焊接速度在不同的参数范围对热输入的贡献是不同的.在相同的旋转速度与焊接速度比值时,随焊接速度的增加,热输入和接头力学性能的关系也不是线性的.所以不能用旋转速度与焊接速度的比值来衡量热输入的大小。

Abstract:

Different from the relationship of heat input and welding speed at melting welding, which submits inverse ratio, the relation is quite complex for friction stir welding. This paper studies the relation of welding speed and heat input at aluminum alloy friction stir welding based on thermogenesis of friction and plastic deforming. The result shows that welding speed and heat input relationship is nonlinear and shows a complex shape, which means welding speed, depending on various ranges of parameter, contributes variably to heat input. When rotary speed to welding speed ratio is constant, with the increase of welding speed, heat input and the mechanical behavior of the joint decreasing is not linear. Thus, heat input should not be measured by rotary speed to welding speed ratio.