Method of Providing a Laser Welded Product and a Laser Welded Product

A method of welding a first and a second element to each other by transmitting radiation in a predetermined direction to an interface between the two elements, the method comprising:

• 1. providing the first element having, in the direction, a first layer and a second layer attached to each other, the first layer having a first absorption coefficient, μa1>0.4 mm−1, at a wavelength of the radiation and the second layer having a second absorption coefficient, μa2>0.1 mm−1 at the wavelength,
• 2. providing the second element with, in the direction, a third absorption coefficient, μa3, at the wavelength, the third absorption coefficient being lower than the first and second absorption coefficients,
• 3. positioning the second element so as to abut or be proximate to the first layer and so that the radiation penetrates the second element, along the direction, before penetrating into the first layer,
• 4. providing a third layer having a scattering coefficient, μs>0.4 mm−1, at the wavelength, between the first and second layers, in the direction of the radiation, and
• 5. providing radiation along the direction, the radiation:
• penetrating the second element,
• heating the first layer so as to weld the first layer to the second element, and
• radiation having penetrated the first layer being scattered by the third layer.

A method of welding a first and a second element to each other by transmitting radiation in a predetermined direction to an interface between the two elements, the method comprising:

• 1. providing the first element having, in the direction, a first layer and a second layer attached to each other, the first layer having a first absorption coefficient, pal, at a wavelength of the radiation and the second layer having a second absorption coefficient, μa2>0.1 mm−1 at the wavelength,
• 2. providing the second element with, in the direction, a third absorption coefficient, μa3, at the wavelength, μa3>μa1 and μa3>0.4 mm−1,
• 3. positioning the second element so as to abut or be proximate to the first layer and so that the radiation penetrates the first layer, along the direction, before penetrating into the second element,
• 4. providing a third layer having a scattering coefficient, μs>0.4 mm−1, at the wavelength, between the second element and the second layer, in the direction of the radiation, and
• 5. providing radiation along the direction, the radiation:
• penetrating the first layer,
• heating the second element so as to weld the first layer to the second element, and
• radiation having penetrated the second element being scattered by the third layer.

A laser welded element comprising, in a predetermined direction,

• 1. a first element comprising a first layer and a second layer attached to each other, the first layer having a first absorption coefficient, μa1>0.4 mm−1, at a wavelength of the radiation and the second layer having a second absorption coefficient, μa2>0.1 mm−1 at the wavelength,
• 2. a second element with, in the direction, a third absorption coefficient, μa3, at the wavelength, the third absorption coefficient being lower than the first and second absorption coefficients, the second element being positioned so as to abut or be proximate to the first layer and so that the radiation penetrates the second element, along the direction, before penetrating into the first layer,
• 3. a third layer positioned between the first and second layers, in the direction of the radiation, and having a scattering coefficient, μs>0.4 mm−1, and
• wherein the first layer is welded to the second element, the third layer is attached to one of the first and second layers and is not attached to the other of the first and second element.

A laser welded element comprising, in a predetermined direction,

• 1. a first element comprising a first layer and a second layer attached to each other, the first layer having a first absorption coefficient, pal, at a wavelength of the radiation and the second layer having a second absorption coefficient, μa2>0.1 mm−1 at the wavelength,
• 2. a second element with, in the direction, a third absorption coefficient, μa3>μa1 and μa3>0.4 mm−1, at the wavelength, the second element being positioned so as to abut or be proximate to the first layer and so that the radiation penetrates the first layer, along the direction, before penetrating into the second element,
• 3. a third layer positioned between the second element and the second layer and having a scattering coefficient, μs>0.4 mm−1 in the direction of the radiation, and
• wherein the first layer is welded to the second element, the third layer is attached to one of the first and second layers and is not attached to the other of the first and second element.