UNDERCUT

DEFECT WELD

(VISUAL)

UNDERCUT

UNDERCUT

Because
1. Temperature metal too high .
2. Ampère capping high .
3. Speed capping too low

Result
1. Weaken connection.
2. Started rust the surface.
3 .Cause voltage sliding ( displacement stress ) potential to crack .

Countermeasures :
1. Enough clean up with wire brush and filling it with stringer ( welding lane single without swing according wps repair.

Rejection criteria :
1. The depth of more than 1/32 “or more than12 ½ % thick nominal material.
2. The depth of more than 1/64” to 1/32 “or more than 6% to 12 ½ % thick nominal material.
3. A length of more than 2 “ in 12 “ Welds or more than 1/6 length weld.
4. ROOT UNDER CUT more than 2” in 12 “ ROOT or more than 1/4 length ROOT .

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SURFACE COLD LAP

DEFECT WELD

(VISUAL)

SURFACE COLD LAP

SURFACE COLD LAP

Because
1. Temperature metal low.
2. Capping ampère low.
3. Swing not fixed.
4. The surface of the material dirty.

Result
1. Is incomplete fusion Potentially crack.
2. Arising suspicion that all lane welds been implemented ampère low so as to lead to fusion between elementary substance with the welds or inter lane imperfect.

Countermeasures :
1. If suspicion not proved , then cold laps sufficient in grindstone with the uniform.
2. If suspicion proven and all the troubled demolished ,repair welding as WPS repair .
3. If it is still troubled,Change welder.

Rejection criteria :
The existence of surface cold laps were rejected and must be repaired.

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INVERTEC® V155-S STICK WELDER (SMAW)

INVERTEC® V155-S STICK WELDER

Top Features

• Two stick modes, SOFT and CRISP, provide the right arc characteristics for different types of electrodes.
• Fan-As-Needed™ (F.A.N.™) reduces noise and dust inside the machine.
• Auto-Adaptive Arc Force minimizes electrode sticking in the puddle without compromising arc stability or increased spatter.
• Automatic Hot Start boosts the current during starting to make striking an arc easier.
• Touch Start TIG® mode – it’s like getting a TIG welder for free!

Input Power

• 115/230/1/50/60

Processes

• Stick, DC TIG

Portable. Professional. Rugged. Affordable.


The Invertec® V155-S offers much more than you would expect from a welder this size. Weighing in at just under 15 lbs. (6.8 kg) the Invertec® V155-S is no lightweight contender. It packs the full punch of a heavyweight professional that you can take to the most demanding job sites. It features 120/230V auto reconnect operation and can operate from a portable generator. It can also plug into a 200 ft. (61 m) 230V extension cord so you can weld just about anywhere.

• Two stick modes, SOFT and CRISP, provide the right arc characteristics for different types of electrodes. 
• Fan-As-Needed™ (F.A.N.™) reduces noise and dust inside the machine. 
• Auto-Adaptive Arc Force minimizes electrode sticking in the puddle without compromising arc stability or increased spatter. 
• Automatic Hot Start boosts the current during starting to make striking an arc easier. 
• Touch Start TIG® mode – it’s like getting a TIG welder for free!

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