Electrical connector with improved contacts

1. An electrical connector comprising:

a first insulative housing having a plurality of receiving channels;

a plurality of first contacts retained in corresponding receiving channels of the first insulative housing, each first contact comprising a main portion, a contacting section located in front of the base portion, and a soldering section behind the base portion; and a metallic shell shielding on the first insulative housing; wherein each first contact has a first sub-contact and a second sub-contact stacked with each other, and

the first sub-contact comprises a first main section and the soldering section, the second sub-contact comprises a second main section and the contacting section, the first main section is superimposed on the second main section to form the main portion, and the main portion of the first contact has a larger thickness than the contacting section and the soldering section; wherein the first sub-contact and the second sub-contact are laser welded to each other; wherein

the metallic shell includes a top shell and a bottom shell assembled with each other, and the top shell and the bottom shell comprise a plurality of cooperating bumps and latching holes; wherein

an insulative cover over-molded on the metallic shell.

2. The electrical connector according to claim 1 , further comprising a cable electrically connected with the first contacts, and wherein the cable comprises a plurality of wires soldered with corresponding soldering sections of the first contacts.

3. The electrical connector according to claim 1 , wherein one of the first sub-contact and the second sub-contact defines a plurality of posts, and the other of the first sub-contact and the second sub-contact defines a number of holes for receiving corresponding posts.

4. An electrical connector assembly comprising:

an electrical connector connected with a cable and comprising a first insulative housing and a plurality of first contacts received in the first insulative housing, each first contact including a main portion, a contacting section in front of the main portion, and a soldering section behind the main portion, the cable including a plurality of inner conductors; and

a complementary connector mating with the electrical connector and comprising a second insulative housing and a plurality of second contacts retained in the second insulative housing; wherein the main portion of each first contact is formed by two pieces stacked with each other, and

the thickness of the main portion of one first contact is substantially same as a combined thickness of one inner conductor and a corresponding soldering section soldered with the one inner conductor and is same as a total thickness of the contacting section of one first contact and a corresponding mating section of the second contact in contact with the one first contact; wherein

each first contact has a first sub-contact and a second sub-contact stacked with each other; wherein

the first sub-contact comprises a first main section and the soldering section, the second sub-contact comprises a second main section and the contacting section, and the first main section is superimposed on the second main section to form the main portion; wherein

one of the first sub-contact and the second sub-contact defines a post, and the other of the first sub-contact and the second sub-contact defines a the post; wherein

the first sub-contact and the second sub-contact are formed a firm combination between each other by laser welding.

5. The electrical connector assembly as claimed in claim 4 , wherein the main portion of each first contact has a larger thickness than the contacting section and the soldering section.

6. An electrical connector assembly comprising:

an electrical connector including an insulative housing with a plurality of contacts disposed therein,

each of said contacts formed from sheet metal via stamping and forming, and extending along a front-to-back direction and essentially including two elongated pieces tightly stacked with each other in a vertical direction perpendicular to said front-to-back direction, each of said contacts defining a front contacting section, a rear tail sections and a main section therebetween along said front-to-back direction; wherein

each of said contacts essentially keeps a same density along the front-to-back direction and defines a first thickness on the main section and a second thickness on either the contacting section or the tail section, said first thickness being generally twice with regard to the second thickness; wherein

one of said two elongated pieces forms the contacting section and a part of said main section, and the other of said two elongated pieces forms the tail section and another part of said main section; wherein

one of said two pieces defines a post, and the other of said two pieces defines a hole for receiving the post; wherein

said two pieces form a firm combination by laser welding.

7. The electrical connector assembly as claimed in claim 6 , wherein the front contacting section and the rear tail section are formed by said two elongated pieces, respectively.

8. The electrical connector assembly as claimed in claim 6 , wherein said two pieces are discrete from each other without unitary joint therebetween at a lateral side edges but in a tightly stacked manner in the vertical direction.

9. The electrical connector assembly as claimed in claim 6 , wherein the main section forms barbs for retention.

10. The electrical connector assembly as claimed in claim 6 , wherein said connector is a plug connector equipped with a cable having wires mechanically and electrically connected to the tail sections of the corresponding contacts, respectively.

11. The electrical connector assembly as claimed in claim 6 , further including another connector with terminals mechanically and electrically connected to the contacting sections of the contacts, respectively.

12. The electrical connector assembly as claimed in claim 11 , wherein said connector is a plug connector equipped with a cable, and said another connector is a receptacle connector for mounted to a printed circuit board.

13. The electrical connector assembly as claimed in claim 6 , wherein one of said two pieces forms a post to be inserted into a hole formed in the other of said two pieces.