A. Usage and Application of LHA/ LHC/ LHT Series Gantry Moving SAW H Beam Welding Machine:

1. Function of I H Beam Submerged Arc Welding Machine:

1) Task: I H Beam SAW Welding Machine produces welding H Beam in high efficiency/ Controllable, stable and high standard performance, completes continuous/ large current/ Deep or full penetration welding on assembled H Beam/ I Beam, the most critical step in line of welding H Beam production:

a) Typical H Beam submerged arc welding: The 45° orientated H Beam for welding, the overhead welding torch right above H Beam, the air cylinder type welding arc tracker: (Fig.1)

b) Wuxi JACK LHA5Z model middle operation machine and its finished H Beam, at customer workshop: (Fig.2)

2. Workpieces Characteristics from H Beam SAW Welding Machine:

1) Mechanical Property: Compared with rolling H Beam, welding H Beam has larger dimension and stronger strength, which is indispensable workpieces in every sector of steel structure building. The finished welding H Beam can have sizes of:

a) Height up to 1,200mm/ 1,500mm/ 1,800mm/ 2,000mm. Note: For H Beam web higher than 2,000mm, automatic welding is not applicable. Under such cases, manual welding should be adopted;

b) Width up to 800mm;

c) Thickness up to 40mm/ 50mm/ 60mm/ 80mm;

d) Material of steel with Chinese grade Q235/ Q345, yielding strength 370MPa to 600MPa;

2) Welding Times on a H Beam: There are 4 passes of welding seam, which need to be fabricated in any one piece of I/ H Beam. Correspondingly, H Beam needs to be flipped 90°/ 180°, in the period of SAW fabrication in the machine;

3. Work Station of SAW I H Beam Gantry Welding Machine:

1) This is the second set of core equipment in I H Beam Production Line;

2) Following H Beam Assembly and Tack Welding Machine;

3) And preceding to H Beam Flange Straightening Machine;

4) These 3 machines constitute the basic working stations for welding H Beam manufacture;

4. Vital Importance of H Beam SAW Welding Machine:

1) Welding seam is the essential index for appraising on quality of finished welding H Beam: Its fusion/ penetration/ cover face/ free of defect such as porosity/ mechanical strength;

2) All these indicators are managed during SAW welding operation in the machine;

3) So, performance of machine directly determines quality of finished welding I/ H Beam.  

B. Classification on LHA/ LHC/ LHT Series Gantry Moving H Beam SAW Welding Machine:

Depending on machine mechanical main frame, this product group can be divided into three main sub groups of:

1. LHA Series H I Beam Gantry Welding Machine:

A set of Wuxi JACK LHA5Z model center operation machine, and its 2 pieces of finished H Beam: (Fig.3)

1) Mechanical Main Body of the LHA models machine is an enclosed box frame, driven with motor for its moving along parallel rails;

2) The 2 pieces of welding torches and supporting units are assembled onto the gantry frame;

3) SAW welding is carried out, along with gantry frame moving along parallel rails;

4) The 2 pieces of workpiece H Beam are laid on its workshop floor fixed triangular brackets;

5) Working velocity (SAW welding speed) is controlled with A.C. inverter, and displayed instantaneously on hanging operating panel;

6) Subdivision on LHA Models I H Beam Gantry Welding Machine:

a) LHAC side managing series: Two Operators stand at external sides of machine respectively for operation. The size of H Beam can be larger:

Wuxi JACK LHA5C model side operating machine, and its two operators: (Fig.4)

b) LHAZ middle managing series: One operator stands at middle of machine work zone, between the 2 lines of racks. The size of H Beam is relatively a bit smaller:

Wuxi JACK LHA5Z model middle operating machine at customer facility: (Fig.5)

Each type of machine has several models, which differs on rail span. For example, LHA4C, this refers to 4,000mm parallel rail span of LHA model machine.

7) Wide Use: LHA series I H Beam Gantry Welding Machine has top selling volume, among all models on H Beam SAW welding;

8) Applicable Application Site:

LHA series machine is operated as individually working equipment, not suitable for being deployed in automatic H Beam Production Line. It usually works in the form of one set or two sets as a group;

a) One set of Wuxi JACK LHA4Z model center managing machine: (Fig.6)

b) 2 sets of Wuxi JACK LHA5Z model central control machine: (Fig.7)

2. LHC Model Trolley Moving Cantilever SAW H Beam Welding Machine:

1) Mechanical main body of the LHC model is a motor drive column boom cantilever structured trolley;

2) The single piece of welding torch is assembled onto overhang boom of the motor drive moving trolley;

3) SAW welding is carried out, by means of trolley moving along parallel rails and H Beam;

4) The single piece of workpiece H Beam is laid on hydraulic drive 60° Overturning Racks;

Wuxi JACK LHC model machine, the 1,500mm web height H Beam, and its 60° Overturning Racks: (Fig.8)

5) Working velocity (SAW welding speed) is controlled with A.C. inverter, and displayed instantaneously on column embedded operating panel of machine;

6) Applicable Application Site: Most majority of LHC work in SAW zone of automatic H Beam Production Line, 4 sets as a group, forming SAW zone:

Wuxi JACK automatic H Beam Production Line and its 4 sets of LHC model H Beam SAW Welding Machine: (Fig.9)

3. LHT Model T Frame Gantry Moving H Beam Submerged Arc Welding Machine:

1) Mechanical main Body of the LHT model is a set of motor drive T frame;

2) The 2 pieces of welding torches are assembled onto motorized moving T frame;

3) SAW welding is carried out, along with T frame moving along parallel rails and H Beam;

4) The 2 pieces of workpiece H Beam are laid onto its facility land secured double triangular racks;

5) SAW Welding velocity is controlled with VF variable frequency A.C. inverter, and displayed in real time, on hanging machine operating panel;

6) Applicable Application Site: Same as LHA, LHT also works as individual equipment on H Beam SAW welding, in the form of one set or two sets;

Installing 2 sets of Wuxi JACK LHT model I H Beam Welding Machine: (Fig.10)

C. Main Specifications of LHA/ LHC and LHT I H Beam Submerged Arc Welding Machine:

1. Suitable Workpiece Size for Different Models of I H Beam SAW Welding Machine:

1) LHC and LHT models, its available max. web height of H Beam can be up to 1500mm to 2000m;

2) LHA series, there are 5 standard models as below:

2.  Typical Technical Parameters of SAW H Beam Welding Machine: