Steel structure engineering is the most basic material condition to satisfy people's daily life and production, work activities, so it must has a certain use value and quality requirement.However,during the production and installation,steel structure produces many quality problems,because of various aspects influence factors.In order to solve and avoid any more quality issues,we need to have a realize of the quality forming process and impact factors.

1 Quality formation of the steel structure engineering

The whole construction process,from parts processing to structure installation,is also the forming process of steel structure engineering, also is the process of gradually formed its engineering quality.The forming of quality mainly in the stage of design, production, installation, testing etc.

1.1 Design quality is the basic of structure quality

A high quality building product depends on the quality of design.The design of steel structure construction includes two aspects of content: Firstly, the steel structure design, it is the construction drawings that based on the welding parameters,quality objectives provided by the construction of the out-contracting units and after the construction design and calculation.In this stage, according to geological exploration report, determine the type of foundation and structure;Calculations and determine the section size of the steel column, steel beam, crane beam etc;Adopted steel grade and thickness;How to collocation the color of the wall and roof panel ;As well as the size of the weld and so on.These contents will decide the function and quality of the construction project.This stage is designed by qualified unit to carry on.Secondly,the preparation of construction details,its purpose is directly used for manufacturing, processing and installation construction.Thus, the design phase is the key to the steel structure engineering quality.That is to say, without high quality design, there is no high quality steel structure products.And the design of high quality has a close relationship with designers level.

1.2 The construction quality is the assurance of steel structure engineering quality

In steel structure engineering, the quality of component production directly affects the quality of the steel structure engineering.Because this is a stage that based on the designed construction detail to manufacture and installate.This is the main stage that quality formed,so when manufacture the steel structure component,we need to adopt advanced and efficient machinery equipment,in strict accordance with the construction technology process. Qualified components will be formed a whole structure after installation,then a new structure of quality formed.The keys that decide the quality of steel structure production and installation of components are:Firstly,the level of qualification,production equipment,testing equipment,the workers' quality,the construction technology,and construction technical ability.Secondly,wheather the supervision engineer and quality inspection person has the ablity of construction organization and coordination.Thirdly,wheather the supervision engineer and quality inspection person can do the work of examination and acceptance well according the specification of examination and acceptance of steel structure.

1.3 Acceptance is the control of quality of steel structure engineering

Quality inspection is the main technical mean to prevent the nonconforming to shed into the next working procedure or construction site.In steel structure engineering, in addition to quality inspection on each inspection lot acceptance, we also need the base tank acceptance,the main structure acceptance,project completion inspection and acceptance after completion.The acceptances above were leaded by project contracting units, the quality of supervision units, design units together.These quality acceptance activities can test if the production quality, construction installation quality meet the national standard of acceptance evaluation or the requirements of the contract.Therefore, the quality acceptance is the steel structure project quality control activities, is responsible for the construction project of the specific performance.

1.4 The warranty of quality is the continuation of steel structure quality

After the result of project completion acceptance is qualified, the steel structure engineering can be delivered to use.However, is not to say that the project is perfect, have no quality problems.In the process of using, hidden quality problems will gradually exposed.At this moment, to satisfy the users, project contractors and the out-contracting units in accordance with the relevant provisions of the "building law", signed "the quality of the builders",the warranty period of the relevant parts will set down in the form of contract.When quality problem occurs in the future, the warranty of quality can be in accordance with the terms of the contract,prolong the engineering quality effectively.