Nissan Armada 2025-2026 Service and Repair Manual: MIG Welding
MIG is the abbreviation for metal inert gas shielded arc welding. MIG welding has the following special features.
(1) NORMAL MIG WELDING
MIG welding is the most commonly used welding method. As shown in the figure, a wire serving as an electrode is continuously fed into the welding area, and an arc is generated between the wire tip and the parent metal. Normally, an electrode wire measuring 1.2 mm - 1.4 mm (0.047 in - 0.055 in) in diameter, with an electrical current of 110 A - 360 A, is used for welding a plate having a thickness of 2 mm (0.079 in) or more.
(2) SHORT ARC MIG WELDING METHOD
When welding a thin plate, a short arc welding method is generally used.
As shown in the figure, a short circuit and arc pattern is repeated.
When compared to ordinary MIG welding, using this short circuit transient method requires less heating, and therefore welding of a thin plate measuring 1 mm (0.04 in) in thickness can be accomplished.
The short arc welding conditions are shown below.
For the torch in the short arc welding, a thin wire measuring 0.8 mm - 1.2 mm (0.031 in - 0.047 in) in diameter and wound in a small spool is installed.
Plate thickness t = mm (in) | Shape of welding | Current (A) | Voltage (V) | Argon flow rate  (US gal, Imp gal)/min | Welding speed mm (in)/min |
|---|---|---|---|---|---|
| 1 (0.04) |
| 45 | 12 | 13 (3-3/8, 2-7/8) | 600 (23.62) |
| 2 (0.08) | 85 | 15 | 15 (4, 3-1/4) | 600 (23.62) | |
| 3 (0.12) | 120 | 22 | 15 (4, 3-1/4) | 600 (23.62) |
(3) PULSED ARC WELDING METHOD
To enable spray transfer, even in the current range, which is equivalent to or lower than the critical current (spray transfer limiting current), pulse waveform is added to this welding method. Because this method allows stable penetration and bead shape while preventing heat gain, it is suitable for thin plate welding.
LOW PULSE FUNCTION
In addition to the pulse function, this function makes it easier to create imbricate bead shape.
It is effective in preventing burn through during the thin plate welding and the welding of panels with a gap present in between.
TIG Welding
TIG is the abbreviation for tungsten inert gas shielded arc welding. TIG has the following special features.
Special features
Initial cost of the equipment is low, as is maintenance expense.
For ordi ...
MIG Welding Method
(1) PLUG WELDING
MIG plug welding method is used to repair the spot welded portions.
Keep the upper panel and lower panel tightly together. Before welding, contact closely the points to be plug welded ...
Other materials:
Fluids and Lubricants
Recommended Fluid and Lubricants
The following are approximate capacities. The actual refill capacities may be slightly different. When refilling, follow the procedures described elsewhere in this manual.
Fluid type Capacity (approximate) Recommended Fluids/Lubricants Metric
Measure US
Measure Im ...
Removal and Installation
REMOVAL
Remove front fillet molding fixing screws .
Apply protective tape (A) on the part to protect it from damage.
Disengage front fillet molding fixing pawl indicated by arrows as shown in the figure.
: Pawl
Disengage fixing clips, and then remove front fillet molding indicated by arrows ...
Removal and Installation
CAUTION:
Always work with a helper.
REMOVAL
Remove moonroof unit assembly. Refer to Removal and Installation.
Remove rear moonroof glass fixing screws , and then remove rear moonroof glass.
Remove fixing clips, and then remove center reinforce frame from rear moonroof glass.
: Clip
INSTALLATI ...
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