MIG welded joint between aluminum and steel members and MIG welding process
First Claim
1. A process for performing MIG welding between aluminum and steel members, by overlapping the aluminum member with the steel member and performing a MIG welding operation on an end face of the aluminum member, said process comprising the steps of:
- providing an aluminum member having a thickness P ranging from 0.5 to 2.0 mm and a steel member having a thickness Q satisfying the following formula;
0.6≦
Q/P≦
0.8;
providing a filler wire made of a 4000 or 5000 series aluminum alloy having a diameter L ranging from 0.8 to 1.6 mm;
locating the filler wire such that, a center line of the filler wire is positioned between a distance of L away from a reference point toward an overlapped region of the aluminum member and the steel member and a distance of 2 L away from the reference point toward a side opposite to the overlapped region, the reference point being set at a corner of the end face of the aluminum member on the steel member side; and
applying a pulsed DC to the filler wire so as to constantly form a molten weld pool at a weld zone, the pulsed DC allowing one molten droplet to fall with each pulse at a pulse frequency of 0.5 to 5 times per a welding length of 1 mm, while allowing the filler wire to come into contact with the molten weld pool at a frequency of 0.1 to 4 times per a welding length of 1 mm in order to cause a short circuit, whereby the MIG welding operation is performed along the end face of the aluminum member.
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Accused Products
Abstract
A MIG welded joint between aluminum and steel members is obtained by overlapping the aluminum member and the steel member each other and performing MIG welding using a filler wire made of a 4000 or 5000 series aluminum alloy on an end face of the overlapped aluminum member, wherein the aluminum member has a thickness P ranging from 0.5 to 2.0 mm, and the steel member has a thickness Q satisfying the following formula: 0.6≦Q/P≦0.8, whereby a penetration depth of the steel member is equal to or less than 5% of the thickness Q thereof.
13 Citations
8 Claims
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1. A process for performing MIG welding between aluminum and steel members, by overlapping the aluminum member with the steel member and performing a MIG welding operation on an end face of the aluminum member, said process comprising the steps of:
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providing an aluminum member having a thickness P ranging from 0.5 to 2.0 mm and a steel member having a thickness Q satisfying the following formula;
0.6≦
Q/P≦
0.8;providing a filler wire made of a 4000 or 5000 series aluminum alloy having a diameter L ranging from 0.8 to 1.6 mm; locating the filler wire such that, a center line of the filler wire is positioned between a distance of L away from a reference point toward an overlapped region of the aluminum member and the steel member and a distance of 2 L away from the reference point toward a side opposite to the overlapped region, the reference point being set at a corner of the end face of the aluminum member on the steel member side; and applying a pulsed DC to the filler wire so as to constantly form a molten weld pool at a weld zone, the pulsed DC allowing one molten droplet to fall with each pulse at a pulse frequency of 0.5 to 5 times per a welding length of 1 mm, while allowing the filler wire to come into contact with the molten weld pool at a frequency of 0.1 to 4 times per a welding length of 1 mm in order to cause a short circuit, whereby the MIG welding operation is performed along the end face of the aluminum member. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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Specification