A brazing process for joining two metal components (21, 22) by means of a plant (1) comprising:
- a support element (2), which is arranged for supporting a first component (21);
- a laser source (3), which is arranged for emitting at least one laser beam (30);
- a brazing module (4), which comprises at least one operative head (5), which is
- extended at least along a transverse direction (Y) and defines a work axis (Z) which is
- orthogonal to said transverse direction (Y) and along which said first component (21) is
- intended to be placed;
- said operative head (5) comprising:
- a first beam splitter (6), adapted to intercept said laser beam (30) and to divide said laser beam (30) into at least two split laser beams (60), which are propagated away from said work axis (Z);
- at least two directing optics (7), which are placed spaced from each other along
- said transverse direction (Y) and in opposite positions with respect to said work axis (Z),
- are each adapted to intercept the corresponding said split laser beam (60) and to generate
- a corresponding said working laser beam (70), which is propagated towards said work
- axis (Z) in order to intercept at least said first component (21);
- said process comprising the following operating steps:
- a step of arranging said first component (21), which is metallic, with tubular
- form with first axis (X), provided with a brazing zone (200) extended at least around said
- first axis (X), and is provided, at least in said brazing zone (200), with a diameter (D);
- a step of arranging a second component (22), metallic, having a connection
- portion (25) placed at the brazing zone (200) of said first component (21), defining with
- said first component (21) a junction slit (23);
- arranging a bead (24) of welding material on a mouth (26) of said junction slit (23);
- a step of
- a step of positioning the at least one operative head (5) of said brazing module
- (4) with said work axis (Z) aligned with the first axis (X) of said first component (21);
- an irradiation step, in which said laser source (3) is turned on and said operative
- head (5) generates two working laser beams (70), which are propagated towards said
- work axis (Z) to intercept at least said first component (21) at least in said brazing zone
- (200), being projected on two corresponding impact areas (201) placed in diametrically
- opposite positions with respect to the first axis (X) of said first component (21);
- in which, following said irradiation, said bead (24) at least partially melts,
- penetrating into said junction slit (23);
- wherein, in said irradiation step, at said brazing zone (200) each said working laser beam
- (70) has a width (L) defined along a direction (d) orthogonal to said work axis (Z);
- wherein the ratio between the width (L) of said working laser beam (70) and the diameter (D) of said first component (21) is greater than or equal to 0.5.